FitBall Ab Crunch 13 August 2018 Submitted by sonia on 13 August 2018 [FitBall Ab Crunch] 大大個fitball自己買左唔識點用? 好多人都話腰酸背痛用fitball最好, 其實唔止拉筋有用, 做訓練都一流架! 運動 肌力運動 亞桑channel