MANUAL RUNNER

Manual Treadmill Commercial Gym Equipment Self-Power Curve Treadmill. Anti-Gravity Treadmills The curve treadmill is a manual treadmill that, yup, has a curved surface: You run in the bottom of an arc. Gravity plays neat tricks here. Stepping farther up the arc speeds you up, while stepping farther down slows you down—all of which requires better form and greater control over your gait.