Exerpeutic 100XL High Capacity Magnetic Resistance Manual Treadmill Tested up to 325lbs of user weight Twin 6" diameter flywheels provide a smoother and more consistent workout unlike other single flywheel manual treadmills Heart pulse pads allows the user to measure target heart rates Wider and longer than most other manual treadmills available, providing benefits that only electric treadmills provide Extra long safety handles are more than 2X the length of other typical treadmill handles, provide walking security and preventing any loss of balance