California Fitness CurveMill II Treadmill

The California Fitness CurveMill II Treadmill is a self-powered, non-motorized treadmill designed for runners and fitness enthusiasts who want a natural running feel, effective calorie burn, and a quieter, more compact alternative to traditional electric treadmills. Powered entirely by the user, it delivers responsive speed control, enhanced muscle engagement, and a challenging workout suitable for both home and light commercial use. 

Your own body's motion propels the California Fitness CurveMill II. Each stride pulls the belt behind you, requiring no electricity. As you increase your pace, the belt responds by moving faster, so how fast you go at any given time is entirely up to you. The shape also makes it very ergonomic – a U-shaped treadmill reduces joint stress and feels natural while keeping your form in line. Run at your own pace, and you can even train harder with the Curve Selector!

Natural, Self-Powered Running Experience

Unlike electric treadmills that move the belt for you, this curved manual treadmill runs on your stride. As you run, walk, or sprint, you actively pull the belt backward and propel yourself forward—closely mimicking outdoor running mechanics and encouraging proper posture, cadence, and stride control.

The ergonomic curved belt design lets you change speed instantly without buttons, screens, or motors, making transitions seamless from a slow walk to a full sprint.

Efficient Training with Higher Calorie Burn

Running on a manual curved treadmill requires greater muscular engagement, especially in the glutes, hamstrings, calves, and core. This creates a more demanding workout and higher energy expenditure than traditional motorized treadmills.

• Burns up to 30% more calories than electric treadmills
• No speed limit—pace is fully user-controlled
• Responsive belt adapts instantly to stride and effort

Versatile Training Modes & Quiet Performance

This treadmill features magnetic resistance, allowing users to switch between training styles and supporting workouts ranging from endurance sessions to power-focused drills.

• Four exercise modes: Run, Power Walk, Lateral Shuffle, and Low Push
• Magnetic tension system for smooth, controlled resistance
• 4 resistance levels (Gears 1–4 on Curve Selector)
• Quiet, motor-free operation ideal for home environments

Built-in training programs help users track and target key performance metrics, including time, calories, distance, speed, pace, and heart rate.

Durable, Compact & Low Maintenance Design

Built with a premium steel frame and a shock-absorbing deck, this curved manual treadmill is durable, compact, and easy to maintain. The rubber crawler-style running belt is engineered for a long service life, making it a reliable choice for consistent daily training.

• Premium steel frame with shock-absorbent deck
• Rubber slat crawler belt rated for up to 150,000 miles
• Compact footprint suitable for home gyms and studios
• Built-in transport handle and wheels for easy repositioning
• Easy to assemble with minimal maintenance requirements

You can get a more effective training session on a curved manual treadmill than on a high-tech motorized one. Curved treadmills burn up to 30 percent more calories. You engage more muscle groups when you move it yourself.   A study of 13 trained runners (see link below) found that using a curved manual treadmill resulted in a heart rate up to 16% higher. They also had a 2.5% higher running cadence (steps per minute).  Want to level up your workout? With the Curve Selector, you can decide to train even harder by increasing the resistance to make sure you're always going to work up a sweat!

Features:

• Self-Powered & Non-Electric: Driven entirely by your own stride, walking, or sprinting without a motor.
• Well-Cushioned Curved Deck: Designed to encourage a more natural running form and higher calorie burn compared to traditional electric treadmills — better joint protection too!
• Durable Belt Design: 60 engineered slats operating on 124 bearings ensure smooth, reliable performance.
• Adjustable Resistance Levels: Features 4 magnetic resistance settings for light walking, running, and high-intensity interval training (HIIT).
• No Speed Maximum: You power the belt entirely with your own physical force rather than relying on an electric motor.
• Heavy-Duty Build: Constructed with a reinforced steel frame and non-slip heavy-duty rubber slat tracks.
• Curve Selector: Transition easily through resistance levels with the sturdy yet simple selection gear.
• Multiple Grips: Multi-hand-position frame for safety or sled/prowler use
• Mobility: Features a convenient handle and transport wheel for easy location switches.
• Connectivity:  ANT+, Bluetooth. Works with apps such as Kinomap, Zwift, and Aviron.
• Console: Time, Speed, Distance, Calories, Watt, and RPM readouts
• Programs:  HRC, THR, Interval 10/20 & 20/10 as well as Interval Custom