Unlike all that high-impact drudgery, a slow-burn workout involves slowly raising and lowering four or five different sets of very heavy weights that target your major muscle groups. You can do them at home or with a personal trainer.

A slow burn builds all your muscles far more efficiently than aerobics, without stressing your heart. With slow burn workouts your muscles become more metabolically efficient, they utilize oxygen more efficiently. Efficient muscles place less demand on the heart, and your exercise capacity increases.

Want More Strength? Slow It Down. A super-slow weight-training program can dramatically improve strength, users say, and the workout is intense. Substitute for Aerobics?

The super slow method of weightlifting is to lift weights steadily under constant tension for 10 to 14 seconds, then release them slowly for five to 10 seconds. This varies from the usual method of lifting for five to seven seconds.