Rebounding is a safe, cardiovascular muscle-building exercise with very low impact. It is a series of controlled movements performed on a mini trampoline. Running and jogging are very stressful on the feet, ankles, knees, hips, back and the spine. Rebounding decreases the shock and stress by 95% while still giving you a cardiovascular muscular workout as beneficial as running. 20 minutes of rebounding equals 1 hour of running as a cardiovascular workout. Rebounding is more effective for fitness and weight loss than cycling, running or jogging. 12 minutes of rebounding burns about 10 more calories than 12 minutes of jogging.