elongate|elongated

拉伸时，记得慢慢拉长你的肌肉以避免受伤。

Remember to slowly ___elongate your muscles when stretching to avoid injury.

假期因为天气原因被延长了一周。

The vacation was ___elongated by an extra week due to bad weather.

拉伸运动可以延长肌肉，改善柔韧性。

Stretching exercises help ___elongate your muscles and improve flexibility.