These exercises are designed to relax your tense shoulders.

relax 是动词，意思是"放松、使松弛"，由前缀 re-（表示"重新"）和词根 lax（来自拉丁语 laxus，意为"松的"）组成，字面意思是"使重新变松"。在句中指通过锻炼让紧绷的肌肉恢复松弛状态。