You may even find that at least one of these new exercises is as satisfying as your beloved step aerobics. Many workout clubs and gyms with swimming pools provide aqua- or water aerobics. Like step aerobics classes, these are done in groups led by an instructor with background music. You also use specially-designed equipment to provide resistance as you move your arms and legs through the water. This resistance provides a tremendous workout that really gets your heart pumping.
Most bikes have several set programs like hill or interval workouts.
Spin classes, which use a specially designed bike where you pedal against the resistance of a fly-wheel, also make a great aerobic workout. Your club may offer spin classes led by an instructor who takes you through a warm-up and a series of timed intervals of varying pedaling cadence and resistance. Some machines also provide arm handles that give your upper body a workout as well, similar to cross-country skiing. For this excellent aerobic exercise, you wear a vest designed to give you some balance and buoyancy in the pool and simply run in place. The pool water must be deep enough so you don't touch bottom.