Accessory for manually-operated exercise equipment, namely, accessory attachment to increase muscle resistance; body-training apparatus; body-training apparatus for exercise and treatment of all muscles of the body; exercise equipment, namely, arm exercisers, body exercisers, chest expanders, chest pulls, exercise barrels, exercise chairs, exercise platforms, exercise resistance machines, exercise tables, floor supported platforms having movable portion intended for exercise and treatment of all muscles of the body, leg exercisers, resistance exercise machines for various resistance-type body exercises, stair-stepping machines, and torso exercisers; exercise equipment, namely, floor supported platforms having movable portion intended for exercise and treatment of all muscles of the body; exercise equipment, other than for physical therapy purposes, namely, arm exercisers, body exercisers, chest expanders, chest pulls, exercise barrels, exercise chairs, exercise platforms, exercise resistance machines, exercise tables, floor supported platforms having movable portion intended for exercise and treatment of all muscles of the body, leg exercisers, resistance exercise machines for various resistance-type body exercises, stair-stepping machines, and torso exercisers; exercise machines; manually-operated exercise equipment; manually-operated exercise equipment for physical fitness purposes; sporting goods, namely, sports training devices in the nature of balance boards to improve strength, toning, conditioning, balance, and proprioception.;