A lockout mechanism allows for controlled use of exercise equipment. Use is allowed on a time-controlled basis. A predetermined period of time is allocated based on an amount of money paid. The preferred embodiments include a coin-operated, time-controlled, lockout mechanism incorporated onto various types of exercise equipment to prohibit use. The first category including those types of exercise equipment which utilize flywheels, including but not limited to: elliptical trainers, stationary bicycles, stair steppers and cross-country ski machines. This first embodiment employs a friction device to prohibit use. The second category including those types of exercise equipment which utilize adjustable resistance in the form of a weight stack, including but not limited to: universal gyms and nautilus equipment. This second embodiment employs a spring loaded latch mechanism to prohibit use. A third category includes those types of exercise equipment which require electricity to operate. This third embodiment employs a timer circuit to interrupt power to prohibit use.