Key Takeaways
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The AssaultRunner offers a 17" × 62" surface with up to 400 lb capacity, while the Woodway Curve spans 3% to 5% curvature with specs that vary by model.
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AssaultRunner suits HIIT and sprint training with a firmer, responsive belt, while Woodway Curve's slat belt suits endurance runners who want a smoother, more natural stride.
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Runners who want curved belt training at a lower price can consider the SOLE C80 for adjustable resistance, or the TrueForm Runner for a shallow curve built around running form.
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At SOLE Fitness, we built the C80 to bring curved belt training home, with magnetic resistance, bidirectional movement, and the free SOLE+ app included at no subscription cost.
*Note: SOLE does not manufacture or sell the AssaultRunner, Woodway Curve, and TrueForm Runner manual treadmills. This is an independent review of a product for comparison purposes.
The Mechanics Behind Curved Treadmill Training
AssaultRunner and Woodway Curve target different runners because their curved decks are tuned for opposite training styles, one built for explosive intervals and the other for steady endurance mileage.
Picking between them often comes down to how a runner already trains, not just the specs on a sales page. Belt tension and curvature angle change the entire feel of a run, even when two machines look similar side by side.
Choosing the wrong curve can leave a sprinter fighting a deck built for distance, or an endurance runner unable to hold a smooth pace on a rig meant for max-effort surges. That mismatch shows up fast, in sore hips, uneven strides, or a machine that just doesn't get used. Matching the curve to the training goal matters more than any single spec on a comparison chart.
For runners who want curved-belt training without committing to a single-purpose commercial rig, the SOLE C80 offers adjustable magnetic resistance and bidirectional movement that flex with changing training goals.
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AssaultRunner Specs & Key Features
The AssaultRunner lineup combines a self-powered curved running design with durable construction and useful training technology. While the Classic, Pro, and Elite share the same core concept, their build, capacity, and included features vary, giving users different options based on their training needs.
The AssaultRunner is designed for HIIT, sprint, and athletic training, with a quick-response belt and durable construction. (Image source: Assault Fitness)
Performance
The AssaultRunner models use a motorless, self-powered curved running track, so they require no electricity and allow users to control their own pace. Bluetooth and ANT+ connectivity support compatible devices, while built-in programs include intervals, targets, quick start, and competition mode.
Machine Build & Dimensions
The Classic and Pro feature a heavy-duty steel frame, a 17" × 62" running surface, and a 350-lb user capacity. Both weigh 280 lbs and measure 69.7" L × 33.1" W × 64" H. The Elite has a maximum weight limit of 400 lbs and measures 69.9" L × 31.7" W × 64.4" H.
Console & Training Features
Each model includes a high-contrast, UV-resistant console that tracks key workout metrics, including time, speed, RPM, heart rate, and calories. The Elite adds gripped handlebars, water bottle holders, and a media/phone holder.
Durability & Maintenance
The lineup uses solid steel construction and a drivetrain with 100 precision ball bearings and 12 roller guides. The belt is rated for up to 150,000 miles, while the Elite also includes corrosion-resistant hardware, a rust-resistant primer, and a lifetime belt warranty.
Woodway Curve Specs & Key Features
The Woodway Curve lineup includes the Curve, Curve LTG, Curve Trainer, Curve FTG, and Curve XL. All use a self-powered curved design, but they differ in curvature, size, resistance, and intended training use. The standard Curve is built for acceleration and HIIT; the LTG is lighter for home and lighter commercial use; the Trainer uses a lower curve for longer workouts; the FTG adds resistance training, and the XL provides a larger running platform.
Woodway's patented slat-belt design creates a smoother running feel while helping reduce impact during longer workouts. (Image source: Woodway)
Performance
The Curve and Curve XL use approximately 5% curvature, while the Curve LTG, Curve Trainer, and Curve FTG use approximately 3%. All use manually driven curved belts, while the FTG adds 20 resistance levels and up to 60 lbs. of resistance for sprint, strength, and endurance work.
Machine Build & Dimensions
The models vary significantly in size and weight. The Curve measures 70" L × 33" W × 72" H and weighs 355 lbs., while the LTG measures 67.8" L × 33.6" W × 70.1" H and weighs 299.6 lbs. The Trainer measures 73" L × 33" W × 67" H at 350 lbs., the FTG is 76" L × 33" W × 71" H at 400 lbs., and the XL is the largest at 95" L × 38" W × 77" H and 520 lbs.
Console & Training Features
The Curve series is centered on user-powered running, with models designed for different training needs. The Curve supports acceleration, explosiveness, technique, HIIT, and group workouts, while the Trainer targets walking, jogging, and endurance. The FTG adds resistance-based training, and the XL provides more running space for taller athletes.
Durability & Maintenance
Woodway builds the Curve series for demanding training environments, with warranties varying by model. The Curve and Curve Trainer have 5-year frame and belt coverage, while the LTG has a 5-year frame warranty and 3-year belt and moving-parts coverage. The FTG and XL also include 5-year frame and belt warranties. Woodway states that its slat-belt design can last up to 150,000 miles.
AssaultRunner vs Woodway Curve: Head-to-Head Differences
Both lineups offer self-powered curved treadmills, but they target different training needs. AssaultRunner focuses on HIIT, sprinting, and functional fitness, while Woodway offers models designed for acceleration, endurance, resistance training, and commercial use.
Running Feel & Pace Transitions
The AssaultRunner's curved running surface provides a responsive feel that works well for quick pace changes and interval training. Woodway's slat-belt system uses individual slats designed to provide a smooth, natural running feel.
Impact on Joints & Recovery
Both lineups provide a user-powered running experience without a motor-driven belt. Woodway's curved slat-belt design suits users who prioritize a smooth feel during longer sessions, while the AssaultRunner offers a firmer response favored for high-intensity workouts.
HIIT & Sprint Performance
The AssaultRunner suits HIIT, CrossFit, and sprint workouts, with unlimited user-controlled speed, interval programs, and Bluetooth/ANT+ connectivity. Woodway's Curve models also support sprint training, while the Curve FTG adds adjustable resistance for more varied workouts.
Long-Distance & Endurance Training
Woodway focuses more on endurance, with models such as the Curve Trainer designed for walking, jogging, and longer sessions. The AssaultRunner can handle longer runs but is better suited to varied workouts that combine running, intervals, and functional fitness.
Apps & Connectivity
AssaultRunner models support Bluetooth and ANT+ connectivity for compatible fitness devices and include built-in training programs. Woodway's connectivity and console features vary across the Curve lineup, with some models focused more on straightforward workout tracking.
Warranty
AssaultRunner warranty coverage varies by model, with the Elite offering a lifetime belt warranty. Woodway also varies coverage across its Curve models, with several models offering up to 5 years of frame and belt coverage.
The Best Alternatives to the AssaultRunner & Woodway Curve
1. SOLE C80 Curved Manual Treadmill: Best for Home Runners Who Want Versatile Curved-Belt Training
The SOLE C80 Curved Manual Treadmill is our top alternative for home runners who want the intensity and responsiveness of a curved manual treadmill without moving into higher-priced commercial models. Its self-powered 19" × 62" slat belt requires no motor, while bidirectional movement allows both forward running and backward drills. Eight levels of magnetic resistance let users quickly adjust the training load for speed work, strength intervals, and active recovery.
The C80 also adds features that make it particularly practical for home use. Its Bluetooth LCD console displays workout metrics and works with compatible heart-rate equipment, while SOLE+ and Strava connectivity provides additional training options. Every SOLE fitness equipment purchase includes free SOLE+ app access with no monthly subscription, giving users access to hundreds of classes and thousands of hours of exercise content.
On sale for $2,199.99 (regularly $2,399.99), the C80 offers curved-belt training, adjustable magnetic resistance, bidirectional movement, and app connectivity at a lower price than many specialized curved treadmills. It supports users up to 330 lbs., weighs 261 lbs., and measures 72" L × 32" W × 61" H. A lifetime frame warranty, 1-year coverage for the deck, electronics, parts, and labor, and a 30-day satisfaction guarantee further strengthen its value for home users.
The SOLE C80 combines a self-powered slat belt, magnetic resistance, and Bluetooth connectivity for versatile home training.
2. TrueForm Runner: Best for Running Form
The TrueForm Runner is a strong choice for athletes who prioritize natural running mechanics and technique. Priced from $5,995.00, its shallow 2.5" curve and Responsive Belt Technology are designed to respond to changes in balance, posture, hip position, and foot strike, making it particularly suited to running-form and performance-focused training.
It measures 64" L × 36" W × 63" H and has a 17" × 54" running surface. The Runner supports up to 700 lbs. for walking or 450 lbs. for running at top speed and weighs 350 lbs. Its polyurethane belt uses steel radial reinforcement with a bonded Kraiburg Thermolast Overmold Elastomer tread surface.
Built in Connecticut from formed and welded 7-gauge steel, the Runner uses 106 sealed steel ball bearings, solid aluminum pulleys, formed steel handrails, and a rechargeable LED display. It also offers customizable running surfaces, including elastomer, artificial turf, track, and Naboso, while its frame carries a 20-year guarantee.
AssaultRunner vs. Woodway Curve Manual Treadmills: Comparison Table
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Feature |
SOLE C80 |
AssaultRunner |
Woodway Curve |
TrueForm Runner |
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Running Surface |
19" × 62" curved slat belt |
17" × 62" curved surface |
17" × 56"–67" curved slat belt, varies by model |
17" × 54" curved belt |
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Curvature / Resistance |
Self-powered plus 8 magnetic resistance levels |
Self-powered, fixed curve |
Self-powered, 3% to 5% curvature depending on model; FTG adds 20 resistance levels |
Self-powered, shallow 2.5" curve |
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Speed |
Manual, user-controlled, bidirectional |
Manual, unlimited, user controlled |
Manual, no maximum speed |
Manual, user-controlled |
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Weight Capacity |
330 lbs |
350 lbs (Classic/Pro), 400 lbs (Elite) |
Varies by model, up to 400 lbs running |
Up to 450 lbs running, 700 lbs walking |
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Dimensions |
72" L × 32" W × 61" H |
69.9" L × 32.8"–31.7" W × 64"–64.4" H |
70" L × 33" W × 72" H (base Curve, varies by model) |
64" L × 31" W × 63" H |
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Unit Weight |
261 lbs |
280 lbs (Classic/Pro), 289 lbs (Elite) |
355 lbs (base Curve), varies by model |
350 lbs |
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Apps & Connectivity |
Bluetooth, SOLE+, Strava |
Bluetooth, ANT+, built-in interval and competition modes |
Basic display; varies by model |
Basic display, no app integration |
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Warranty |
Lifetime frame, 1 year parts and labor |
5 to 10 year frame, up to lifetime belt on Elite |
5-year frame and belt, varies by model |
20-year frame |
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Best For |
Home users who want versatile curved belt training |
HIIT, sprint, and functional training |
Commercial settings and endurance focused training |
Runners focused on form and technique |
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Price |
$2,199.99, down from $2,399.99 |
Varies by model |
Contact for pricing; LTG from $3,495 |
From approximately $5,995.00 |
Find Your Curved Treadmill Fit with the SOLE C80
The right curved treadmill comes down to training style, not just spec sheets. Sprinters and HIIT athletes may lean toward a firmer, high-intensity feel, while endurance runners often prefer a smoother, slat-belt stride. Either way, the decision affects daily comfort and long-term results.
We built the SOLE C80 to give home runners that same curved-belt intensity, with adjustable magnetic resistance, bidirectional movement, and free access to the SOLE+ app. Explore the SOLE C80 today and find a curved trainer built around your goals, not someone else's routine.
Frequently Asked Questions (FAQs)
Which treadmill is better, Woodway or Assault Runner?
Neither is universally better. Woodway Curve treadmills suit users who want a smooth slat-belt experience and models for different types of training, including endurance, sprint work, and resistance training.
AssaultRunner models are more focused on HIIT, sprinting, and functional fitness, with Bluetooth and ANT+ connectivity and built-in training programs. The right choice depends on the type of training and features you prioritize.
How much does a Woodway Curve cost?
Woodway does not list a standard Curve price on its website and directs customers to contact the company for pricing. The Curve LTG, a lighter-duty member of the Curve family, is currently listed on sale at $3,495, regularly $3,995.
Can you walk on an Assault Runner treadmill?
Yes. The AssaultRunner can be used for walking and running because the belt is powered by the user's movement rather than a motor. The user controls the pace by changing their position and effort on the curved surface. This makes it suitable for slower walking sessions as well as faster running and interval work.
Are curved treadmills hard to run on?
They can take some adjustment, but they are not necessarily harder to run on once you learn the movement. Because the belt responds to your foot placement and body position rather than maintaining a preset motor speed, you have to control your pace actively.
The curved design can also require more engagement than a conventional motorized treadmill. Models with a gentler curve, such as the Woodway Curve Trainer, are specifically designed to make walking, jogging, and longer endurance sessions more approachable.
What is the best curved treadmill on the market?
For most home users, the SOLE C80 is the best curved treadmill on the market. It combines a self-powered 19" × 62" slat belt with eight levels of magnetic resistance, bidirectional movement, a 330-lb. user capacity, and Bluetooth connectivity.
Its current sale price is $2,199.99, down from $2,399.99, making it considerably more accessible than many premium curved treadmills. It also works with the free SOLE+ app and doesn't require a monthly subscription.
*Disclaimer: Products and prices mentioned in this article are accurate as of the date of publication and are subject to change. Please visit the official SOLE website for the most current information.
