One solution may be to buy exercise equipment for use at home. For those of you thinking about buying exercise equipment, the January 1998 issue of Consumer Report has a good summary of exercise equipment, ratings and recommendations. You might want to check it out at your local library before making your purchase of home exercise equipment. Motorized models force you to keep up with their pace. More expensive models have different programs that add to motivation by encouraging you to keep up with the program.
Treadmills benefit the lower body most and can be use for light to heavy aerobic exercise.
Some let you increase resistance. You will outgrow a rider as you get into shape. Riders benefit the whole body for a light to moderate aerobic workout. Some let you program workouts of varying intensity. Exercise bikes benefit the lower body and are good for light to heavy aerobic exercise.