肌肉             jīròu                        muscle

举重             jǔzhòng                   weight lifting

体操             tǐcāo                       gymnastics

骨密度         gǔmìdù                   bone density

关节             guānjié                    joint; articulation

几率             jīlǜ                          probability

骨质疏松    gǔzhì shūsōng          osteoporosis
耐力             nàilì                        endurance; staying power; stamina