收紧腹部肌肉

abdominal crunches───仰卧起坐

These stomach exercises will tighten abdominal muscles.───这些腹部练习会增强腹肌。

Inhale, tighten abdominal muscles, lift left leg, rotate leg slightly upward and move leg to the front and pulse it twice.───吸气，收紧腹部肌肉，抬起左腿，稍稍向上旋转腿部并将腿移向身前震动两次。

Keep back straight, inhale and tighten abdominal muscles and move back to balance on sit bones.───保持后背伸直，吸气并收紧腹部肌肉，后仰身体在坐骨上保持平衡。

Inhale and tighten abdominal muscles and allow back to curve.───吸气并且收紧腹部肌肉，别部呈曲线。

Tighten abdominal muscles to stabilize low back.───收紧腹部肌肉稳住后腰。

Inhale and tighten abdominal muscles and sit tall.───吸气收紧腹部肌肉，坐直。

These stomach exercises will tighten abdominal muscles.