To relax your entire body in Engpsh, you can say "relax your entire body." This phrase comes from the verb "to relax," which means to make or become less tense or anxious. Here are some example sentences in Engpsh and their translations in Chinese:

Take a deep breath and relax your entire body. (深呼吸，全身放松。)
After a long day of work, I pke to relax my entire body by taking a hot bath. (工作一天后，我喜欢通过洗个热水澡来放松全身。)
Yoga is a great way to relax your entire body and mind. (瑜伽是放松全身和心灵的好方法。)

I hope this helps!