肌肉問題~

練橫個膊頭 --- push up
練到背肌, 練橫個膊頭 -- play boxing (my experience)
sit-up -- can減腰 but upper only........if you want to reduce lower.......should be reverse.....the curl up of lower body/ abdominal.........mean lying flat on the floor......bend you knee then lift you lower body up to your upper body.......like sit up/curl up....but lower body up...........

but sit up may hurt your back bone.......better do curl up........curl up is only up til you chest....squeeze you abdominal when you do it.........

健身室高拉機可以練背肌．．．．．．．．．．．．．．．．．