atonic

例句：

1. 1.The atonic muscles are the ones that control movement.
   控制运动的肌腱是肌肉。
2. 2.Atonic muscles are found in the neck and back, where they help with posture and balance.
   在颈部和背部发现的肌腱有助于姿势和平衡。
3. 3.Atonic exercises can help strengthen these muscles and improve flexibility.
   进行肌腱锻炼可以帮助加强这些肌肉并提高灵活性。