For healthy joints. Jump on a Trampoline or mini trampoline daily for at least 5 minutes. That will give you a "Lymphatic Pump" and circulate the synovial fluid to detoxify joints from built up toxins and calcium /salts/ minerals/ and at the same time feed required nutrients, vitamins, etc. Fluctuations on the G force creates negative and positive forces, and stimulates joints. Load/weight stimulus strengthen the joint ligament and bones. Provides compression and decompression cycles to joints. Do your own research about rebounder exercise benefits. There are many, including Joint Health.