The best treadmill for HIIT for most buyers is the Sole F89: a 4 HP motor, a 22 × 60-inch deck, 15% incline and 6% decline for sprint and hill intervals.
If you want quicker speed changes and QuickDial controls, choose Horizon 7.4 AT instead.
All five are ranked by FitScore, which weighs performance most (45%) in this guide.
Comparison Table
| Compareat a glance | TOP PICK | Pick 2 | Pick 3 | Pick 4 | Pick 5 |
|---|---|---|---|---|---|
| Best For | Best Overall | Best Interval Controls | Best Cushioned Alternative | Best Large-Screen Alternative | Best Value |
| Motor | 4 HP | 3.5 HP | 4.25 HP | 3.6 HP | 3 HP |
| Speed | 12 mph | 12 mph | 12 mph | 12 mph | 12 mph |
| Incline | 15% | 15% | 12% | 12% | 12% |
| Running Surface | 22 × 60 in | 22 × 60 in | 22 × 60 in | 20 × 60 in | 20 × 60 in |
| Weight Capacity | 375 lb | 350 lb | 400 lb | 350 lb | 350 lb |
| Check Price | Check Price on Amazon | Check Price on Amazon | Check Price on Amazon | Check Price on Amazon | Check Price on Amazon |
Check Amazon for current pricing and availability.
Key Takeaways
- Best Overall: Sole F89 Trade-offs: 3-year parts coverage and about 314 lb.
- Best Interval Controls: Horizon 7.4 AT Trade-offs: no decline, about 318 lb and no built-in touchscreen.
- How to decide: All five reach 12 mph, so motor power, deck size and incline range separate them.
- Before buying: Treadmill prices change often, so confirm the current price before ordering.
Best Overall: Sole F89
Presentation
Best overall
Editor’s pick
Sole F89
Sole F89 ranks #1 in this guide with a FitScore of 89.3/100. It earns the top spot by pairing a 4 HP motor and 12 mph top speed with 15% incline, 6% decline and a 22 × 60-inch deck for sprint and hill intervals.
FitGearHQ FitScore
FitScore for HIIT
How this FitScore was calculated
This FitScore combines six category scores using weights defined for this guide.
Why Choose This Treadmill
Read our full Sole F89 review for specs, owner feedback and alternatives.
If you want one treadmill for sprints, hill repeats and recovery jogs, the Sole F89 is the most complete choice here. Its 4 HP motor and 12 mph top speed give headroom for hard intervals. In reviews, speed changes were slow, around 40 seconds from 1 to 12 mph, so allow longer ramps for sprint intervals.
A 15% incline and 6% decline let you build hill intervals, and the 22 × 60-inch deck with Cushion Flex Whisper Deck cushioning gives room for a full sprinting stride. Testers also found it stable with no wobble when sprinting. The 375-lb rating and 21.5-inch touchscreen round it out.
At about 314 lb it is heavy to move. For most interval users who want motor headroom, incline and decline, it is the one to check first.
In a Nutshell
Best Usage
- Sprint and hill intervals
- Frequent hard sessions
- Users up to 375 lb
For
- Runners who want a 22-inch-wide deck
- Buyers who value a long warranty
- Third-party app users
Not For
- Buyers on a tight budget
- Buyers who move the treadmill often
- Buyers with very small rooms
Key Specs
- Motor: 4 HP
- Speed: 12 mph
- Incline: 15%
- Running Surface: 22 × 60 in
- Weight Capacity: 375 lb
Pros
- 4 HP motor
- 12 mph top speed
- 15% incline and 6% decline
Cons
- 3-year parts coverage
- Heavy at about 314 lb
- 1-year labor coverage
Best Interval Controls: Horizon 7.4 AT
Presentation
Best interval controls
Rank #2
Horizon 7.4 AT
Horizon 7.4 AT ranks #2 in this guide with a FitScore of 89.2/100. It is the quick-change interval pick, pairing a quick-responding 3.5 HP motor with a 22 × 60-inch deck, 15% incline and a lifetime frame and motor warranty.
FitGearHQ FitScore
FitScore for HIIT
How this FitScore was calculated
This FitScore combines six category scores using weights defined for this guide.
Why Choose This Treadmill
Read our full Horizon 7.4 AT review for specs, owner feedback and alternatives.
If you switch speeds often, the Horizon 7.4 AT is the quick-change interval pick here. Its 22 × 60-inch deck gives room for a full sprinting stride, and 15% incline suits hill repeats.
A 3.5 HP motor and 12 mph top speed handle hard efforts, and 3-zone variable response cushioning adds comfort between them. Reviewers found the motor quick to respond to speed and incline changes, and its QuickDial controls make interval switches easy. It folds, has 10 built-in programs and works with third-party apps.
At about 318 lb it is the heaviest pick, and its 8.25-inch LCD is simpler than a touchscreen. Testers also found the built-in fan weak. If fast speed changes matter most, it is a strong option.
⚖Compared with Our #1 Pick
Horizon 7.4 AT is preferable to Sole F89 when you want quicker speed changes, QuickDial controls and a longer parts warranty. If you want a 4 HP motor, 6% decline and a 21.5-inch touchscreen, the Sole F89 is the better fit.
In a Nutshell
Best Usage
- Hill intervals up to 15%
- Sprint intervals
- Users up to 350 lb
For
- Runners who want a 22-inch-wide deck
- Third-party app users
- Buyers who value a long warranty
Not For
- Anyone who wants a touchscreen
- Buyers who move the treadmill often
- Users who train on a decline
Key Specs
- Motor: 3.5 HP
- Speed: 12 mph
- Incline: 15%
- Running Surface: 22 × 60 in
- Weight Capacity: 350 lb
Pros
- 22 × 60-inch deck
- 15% incline
- 3.5 HP motor
Cons
- No decline
- Heavy at about 318 lb
- No built-in touchscreen
Best Cushioned Alternative: NordicTrack Commercial 1750
Presentation
Best cushioned alternative
Rank #3
NordicTrack Commercial 1750
NordicTrack Commercial 1750 ranks #3 in this guide with a FitScore of 85.5/100. It has the strongest motor here at 4.25 HP, with a 400-lb rating, RunFlex cushioning, 12% incline and 3% decline.
FitGearHQ FitScore
FitScore for HIIT
How this FitScore was calculated
This FitScore combines six category scores using weights defined for this guide.
Why Choose This Treadmill
Read our full NordicTrack Commercial 1750 review for specs, owner feedback and alternatives.
The NordicTrack Commercial 1750 is for interval users who want the most motor in this guide. Its 4.25 HP motor and 400-lb rating give plenty of headroom for repeated hard efforts. Testers of the current version found the motor handled every pace from slow recovery walking up to marathon-specific training, though they measured a speed variance of about 4% that may need calibrating.
A 22 × 60-inch deck with RunFlex cushioning, 12% incline and 3% decline cover sprints and hill work. The 16-inch touchscreen and iFIT compatibility add guided interval sessions.
Its 10-inch step-up is the tallest here, and full guided content needs an iFIT membership. Assembled, it is roughly 38 inches wide and will not fit through standard doorways, so testers treat it as fixed once built. If you want coached intervals on a powerful treadmill, it is a strong option.
⚖Compared with Our #1 Pick
NordicTrack Commercial 1750 is preferable to Sole F89 when you want the strongest motor, a 400-lb rating and iFIT classes. If you want 15% incline and a lifetime frame and motor warranty, the Sole F89 is the better fit.
In a Nutshell
Best Usage
- Guided iFIT intervals
- Users up to 400 lb
- Sprint intervals
For
- Households that use iFIT
- Runners who want a 22-inch-wide deck
- Users who train on a decline
Not For
- Buyers who avoid subscriptions
- Users who prefer a low step-up
- Users who do hill intervals above 12%
Key Specs
- Motor: 4.25 HP
- Speed: 12 mph
- Incline: 12%
- Running Surface: 22 × 60 in
- Weight Capacity: 400 lb
Pros
- 4.25 HP motor
- 400-lb user capacity
- RunFlex cushioning
Cons
- 2-year frame and motor coverage
- Tall 10-inch step-up
- iFIT membership for full content
Best Large-Screen Alternative: ProForm Pro 9000
Presentation
Best large-screen alternative
Rank #4
ProForm Pro 9000
ProForm Pro 9000 ranks #4 in this guide with a FitScore of 83.6/100. It brings a 16-inch touchscreen and iFIT compatibility to a 20 × 60-inch deck, with a 3.6 HP motor and 12 mph top speed.
FitGearHQ FitScore
FitScore for HIIT
How this FitScore was calculated
This FitScore combines six category scores using weights defined for this guide.
Why Choose This Treadmill
Read our full ProForm Pro 9000 review for specs, owner feedback and alternatives.
The ProForm Pro 9000 suits interval users who like a coach calling the efforts. Its 16-inch touchscreen and iFIT compatibility put guided interval classes in front of you.
A 3.6 HP motor, 12 mph top speed and 12% incline cover sprints and hill work, and ProShox cushioning sits under a 20 × 60-inch deck. On the previous generation, testers found the motor strong with smooth acceleration and little frame flex in fast intervals, though incline changes took about 46 seconds from 0 to 12%. The 350-lb rating suits most users.
Full guided content needs an iFIT membership, and its 2-year frame and motor coverage is shorter than the Sole or Horizon. Testers of the previous generation also found the fan weak. If coached intervals keep you consistent, it is a sensible choice.
⚖Compared with Our #1 Pick
ProForm Pro 9000 is preferable to Sole F89 when you want iFIT interval classes on a large touchscreen. If you want a wider deck, steeper incline and longer warranty, the Sole F89 is the better fit.
In a Nutshell
Best Usage
- Guided iFIT intervals
- iFIT classes at home
- Users up to 350 lb
For
- Runners who do sprint intervals
- Anyone who wants a large screen
- Buyers who need a folding frame
Not For
- Buyers who avoid subscriptions
- Buyers who value a long warranty
- Runners who want a 22-inch-wide deck
Key Specs
- Motor: 3.6 HP
- Speed: 12 mph
- Incline: 12%
- Running Surface: 20 × 60 in
- Weight Capacity: 350 lb
Pros
- 16-inch touchscreen
- 3.6 HP motor
- ProShox cushioning
Cons
- Narrower 20-inch deck
- iFIT membership for full content
- 2-year frame and motor coverage
Best Value: XTERRA Sport Series TR75
Presentation
Best value
Rank #5
XTERRA Sport Series TR75
XTERRA TR75 ranks #5 in this guide with a FitScore of 83.5/100. It is the value pick, pairing a 3 HP motor and 12 mph top speed with a 20 × 60-inch deck, 12% incline and 18 built-in programs.
FitGearHQ FitScore
FitScore for HIIT
How this FitScore was calculated
This FitScore combines six category scores using weights defined for this guide.
Why Choose This Treadmill
Read our full XTERRA TR75 review for specs, owner feedback and alternatives.
The XTERRA TR75 is for interval users who want a full-size treadmill. Its 3 HP motor, 12 mph top speed and 350-lb rating handle regular interval sessions.
A 20 × 60-inch deck with XTRASoft cushioning and 12% incline give room for running and hill efforts, and 18 built-in programs add structure without a subscription. Its step-up is a low 7.75 inches.
The 5.5-inch LCD is basic and the deck is narrower than the 22-inch picks. If you want interval-ready performance, it is a practical option.
⚖Compared with Our #1 Pick
XTERRA TR75 is preferable to Sole F89 when price matters most and you still want 12 mph and a 60-inch deck. If you want a stronger motor, wider deck and steeper incline, the Sole F89 is the better fit.
In a Nutshell
Best Usage
- Interval training on a budget
- Users up to 350 lb
- Program-based workouts
For
- Buyers who avoid subscriptions
- Users who prefer a low step-up
- Buyers who need a folding frame
Not For
- Anyone who wants a touchscreen
- Users who do hill intervals above 12%
- Runners who want a 22-inch-wide deck
Key Specs
- Motor: 3 HP
- Speed: 12 mph
- Incline: 12%
- Running Surface: 20 × 60 in
- Weight Capacity: 350 lb
Pros
- 12 mph top speed
- 18 built-in programs
- 350-lb user capacity
Cons
- 2-year parts coverage
- Basic 5.5-inch LCD
- Narrower 20-inch deck
How We Selected the Best Treadmill for HIIT
We started with the question interval users ask most: which treadmill handles repeated sprints and hill efforts best at home? That put performance and durability first in our weighting, followed by comfort, features, practicality and affordability.
We compared motor power, top speed, incline and decline range, deck length and width, cushioning, user capacity, training content and warranty information.
We favored stronger motors, 60-inch decks, steep incline ranges and long frame and motor coverage, because intervals load the treadmill harder than steady sessions. Large screens and app features count for less here than how well the treadmill handles hard efforts session after session. The final five cover different priorities: a high-power incline and decline option, a stable all-round performer, a high-power cushioned pick, a large-screen alternative and a value choice.
Prices change often, so check the current price before you order.
How to Choose the Best Treadmill for HIIT
Start with the motor: The NordicTrack Commercial 1750 lists 4.25 HP, the Sole 4 HP, the ProForm 3.6 HP, the Horizon 3.5 HP and the XTERRA 3 HP. Intervals ask the motor to change pace again and again, so extra power gives headroom for repeated hard efforts.
Check the deck: Sprinting needs room, and all five have 60-inch decks; the Sole, Horizon and NordicTrack are also 22 inches wide. A wider deck gives more room for a sprinting stride and makes quick speed changes feel more secure.
Consider incline for hill intervals: The Sole and Horizon reach 15%, the others 12%, and the Sole and NordicTrack also offer decline. Hill intervals let you push hard at a lower speed, which some people prefer to repeated flat-out sprints.
Compare capacity: The NordicTrack is rated for 400 lb, the Sole 375 lb and the other three 350 lb. Plan for the heaviest regular user with some margin, since hard efforts load the frame more than steady walking.
Decide on guidance: NordicTrack and ProForm use iFIT classes, the XTERRA has 18 built-in programs and the Sole and Horizon work with third-party apps. Coached classes can make intervals easier to follow, while built-in programs and third-party apps offer structured sessions without a subscription.
For weekly activity targets, see the CDC's adult physical activity guidelines and the American Heart Association's physical activity recommendations. On format, a 2021 systematic review and meta-analysis comparing interval training with moderate continuous training found broadly similar body-composition changes, so the best HIIT plan is the one you will keep doing.
Decision Shortcuts
Best Overall: Choose Sole F89 if you want the most complete HIIT treadmill here, with a 4 HP motor, 15% incline and 6% decline; choose Horizon 7.4 AT for quicker speed changes.
Best Interval Controls: Choose Horizon 7.4 AT if you want quick speed changes and QuickDial controls for fast interval switches; choose Sole F89 for decline and a touchscreen.
Best Cushioned Alternative: Choose NordicTrack Commercial 1750 if you want the strongest motor and iFIT classes; choose Sole F89 for steeper incline.
Best Large-Screen Alternative: Choose ProForm Pro 9000 if you want coached intervals on a 16-inch touchscreen; choose XTERRA TR75 to skip subscriptions.
Best Value: Choose XTERRA Sport Series TR75 if you want interval-ready performance; choose Sole F89 for more motor and deck.
Final Verdict
Sole F89 is our first choice for most people shopping for a treadmill for HIIT. Its 4 HP motor, 22 × 60-inch deck, 12 mph top speed, 15% incline, 6% decline and lifetime frame and motor warranty give it the best balance of performance and durability here, just ahead of the Horizon 7.4 AT. Horizon 7.4 AT is the quick-change interval pick with QuickDial controls, NordicTrack Commercial 1750 is the high-power cushioned pick, ProForm Pro 9000 is the large-screen alternative and XTERRA TR75 is the value choice.
For most people who want to train intervals at home, Sole F89 is the model we would check first, after confirming its current price.
Not Sure Which Treadmill Fits You?
Free tool · Treadmill Finder
Your three best-fitting treadmills in five questions
Tell us how you train, your height, weight and space. The finder checks every in-stock model we rank and explains each match.
Start the Treadmill Finder →Frequently Asked Questions about the Best Treadmill for HIIT
Sole F89 combines a 4 HP motor, a 22 × 60-inch deck, 12 mph, 15% incline, 6% decline, a 21.5-inch touchscreen and a lifetime frame and motor warranty, giving it the best balance of performance and durability in this guide.
Horizon 7.4 AT is the closest alternative, with the same 22 × 60-inch deck and 15% incline, a 3.5 HP motor that testers found quick to respond and QuickDial controls, though it has no decline or touchscreen.
FitScore compares how well each treadmill fits home interval training across performance, durability, comfort, features, practicality and affordability using this article's weighting.
Both work. Speed intervals suit runners, while incline intervals raise effort at a lower speed. A treadmill with steep incline and a 12 mph top speed lets you do either.
A 60-inch deck gives room for a full running stride at higher speeds, and all five treadmills here have one.
Horizon 7.4 AT is our first choice for interval training at home. Interval and HIIT workouts need the same things: a motor that recovers quickly between efforts, fast speed and incline changes, a full-length deck and a high top speed. Sole F89 and NordicTrack Commercial 1750 add motor headroom, and ProForm Pro 9000 adds guided interval classes on a 16-inch touchscreen.
Explore More Treadmill Guides
Best Treadmill for Running (2026): Top 5 Picks
Best Incline Treadmill (2026): Top 5 Treadmills With Incline
Best Treadmill for Cardio (2026): 5 Strong Home Picks
Best Premium Treadmill Picks for 2026: 5 High-End Options Worth Buying
Best Treadmill for Marathon Training (2026): Top 5 Picks
Best Curved Treadmill (2026): 4 Self-Powered Picks for Home
This article contains affiliate links. If you click through and make a purchase, we may earn a small commission at no extra cost to you. As an Amazon Associate, we earn from qualifying purchases. We do not show prices because they change constantly: product details and availability can change at any time, so please check the current price and details directly on Amazon. Learn more. Amazon and the Amazon logo are trademarks of Amazon.com, Inc. or its affiliates.
