extensible exercise head

例句：

1. 1.The new exercise head is designed to improve posture and reduce strain on the neck muscles.
   这款新的锻炼头设计用来改善姿势和减少颈部肌肉的压力。
2. 2. This exercise head is perfect for those who want to work out without a gym membership.
   这款锻炼头非常适合那些想要在没有健身房会员的情况下锻炼的人。
3. 3. The exercise head is easy to adjust and can be used for various exercises, making it an ideal choice for fitness enthusiasts.
   这个锻炼头易于调整，可以用于各种运动，是健身爱好者的理想选择。