做瑜伽要拉筋, 請問"筋"&"拉筋"既英文係點寫?

筋 -釋義
1.tendon
2.muscle
3.vein
拉筋- stretching/stretch out =a warm up before doing execisers.

拉筋其實係指做"熱身運動"
warm-up exercise

筋=jin