body flex

例句：

1. 1. The gymnast is performing a body flex routine.
   体操运动员正在表演一个身体伸展动作。
2. 2. After the long day at work, I need to do some body flex to relieve my muscles.
   工作了一整天后，我需要做一些身体伸展来放松肌肉。
3. 3. During the warm-up, athletes often perform body flex exercises to improve their flexibility.
   在热身时，运动员经常进行身体伸展练习以提高灵活性。