[問題] 二頭 彎舉
小弟剛加入健身約三個月，每週2-3次不斷的 胸、背、腿循環。
今天好奇去做了二頭..18kg 15下ok
但第二組剩11下，第三組剩8下...
這是肌耐力不足嗎？要從輕重量開始嗎？
Ps:小弟177/58
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