walk-run: A workout in which you alternate walking and running. By sprinkling running intervals throughout your walking workout, you can spike up exercise intensity and burn more calories.

water aerobics: Aerobics classes that do traditional workouts in waist- to neck-high water in a swimming pool. The resistance of the water makes the workout feel far more intense, while the water cushions you from the impact.

weight machines: Stationary equipment mostly found at gyms that are easy to use and help you to safely and quickly advance through a strength-training workout.

weight-bearing exercise: A type of exercise in which your skeleton is supporting any sort of weight, as it does when you walk, run, or lift weights.

Wushu: The “martial art” or traditional self-defense activities practiced with or without weapons (includes T'ai Chi).