7 Best Curved Treadmill 2025 in the United States

The Assault Fitness Runner Pro is a standout choice for those seeking an effective curved treadmill, especially for high-intensity interval training (HIIT) and endurance workouts. One of its key strengths lies in its motorless design, which means the treadmill is athlete-powered; this can lead to a greater calorie burn and a more intense workout experience compared to traditional motorized treadmills. It's also designed for ease of use and maintenance, requiring minimal setup and no electricity, making it versatile for indoor and outdoor use.

The display features give users access to important metrics such as speed, heart rate, time, and distance, and it can connect via Bluetooth and ANT+ to popular fitness apps, enhancing tracking capabilities and interactive training. Another positive point is the sturdy build quality, made from alloy steel, which supports a significant weight capacity of up to 350 pounds. Its portability is a plus, with built-in wheels for easy movement, though it does weigh 280 pounds, which could make it less convenient for some users to transport.

However, there are some drawbacks to consider. The treadmill requires assembly, which may not be a hassle-free experience for everyone. Additionally, its footprint is quite large at 70 x 33 inches, which might not suit smaller living spaces. The LCD display, while functional, is relatively small at 7 inches, which might not be as user-friendly for viewing workout data from a distance.

The Assault Fitness Runner Pro is ideal for fitness enthusiasts looking for a challenging workout and the freedom to train without electric constraints. However, potential buyers should weigh the assembly and space requirements against their specific needs and living conditions.

The Sunny Health & Fitness Smart Ultra Manual Treadmill features a curved design that promotes natural running mechanics, helping users burn more calories. It offers a spacious running surface (59 x 17.7 inches) that is anti-slip, ensuring safety during workouts. With no motor, users can control their speed entirely, making it suitable for walking, jogging, or sprinting without restrictions. One of its standout features is the free SunnyFit APP, which provides access to numerous workouts and virtual tours at no extra cost.

The treadmill has 8 levels of magnetic resistance, allowing users to adjust their workout intensity easily. Its construction is geared towards reducing joint impact, providing a comfortable workout experience. The durable belt and high-quality components ensure smooth operation with minimal lateral movement. The digital performance monitor offers essential metrics like time, calories, speed, distance, pace, and pulse, although the pulse monitor requires an additional purchase.

It supports a weight capacity of up to 330 lbs, accommodating various users. The treadmill is designed for home use, equipped with transportation wheels and handles for easy mobility. However, at 157 lbs, it might be a bit heavy for some users to move around frequently. The footprint is relatively large (67.7 x 29.9 inches), which could be a consideration for those with limited space. It also requires assembly. Despite these minor drawbacks, its sturdy build, adjustability, and comprehensive tracking features make it a valuable option for those looking to enhance their running workouts at home.

The SB Fitness Equipment CT700 Self-Generated Curved Commercial Treadmill is a solid choice for those looking for a versatile and effective workout machine. One of its standout features is its self-generated power system, which allows users to burn more calories than traditional treadmills. This treadmill is especially beneficial for runners, walkers, and those interested in high-intensity interval training (HIIT) since it has no maximum speed, encouraging diverse workout styles.

With seven resistance levels, the CT700 targets both strength and endurance, making it suitable for a wide range of fitness levels. Immediate speed adjustments are great for those who want to push their limits during sprint sessions. The digital display includes key metrics such as time, distance, speed, and calories burned, keeping users informed about their workout progress.

However, there are some considerations to keep in mind. At 308 pounds, it has a hefty weight, which adds to its durability but may be challenging for some users when moving it. Although it is designed to be portable with transport wheels, its footprint is quite large (76 x 34 inches), which might not fit well in smaller workout spaces. Additionally, assembly is required, which could be a deterrent for those seeking a quick setup. The build quality is robust, made from steel and rubber, supporting a maximum weight of 400 pounds. It also comes with a generous warranty, which adds to its appeal.