This is an excellent ab exercise for strengthening your abs and core muscles. You can find a much more thorough and detailed text description of this exercise and how to do it.
這是一個非常好的強(qiáng)化你的腹部和核心肌肉的腹部運動 。你可以找到關(guān)于這個鍛煉更為深入和詳細(xì)的文字描述,以及如何才能有效鍛煉 。