[請益] 健身影片中的說明
大家好，請教一下
Exercise video:
https://youtu.be/3SRO7IQNHFI
Instructions for the exercise:
Starting Position
Sit upright on the ground with your arms crossed and knees bent. Lift your
feet off the ground.
Step 1
Twist so that your left elbow touches your right knee, then twist the other
way so that your right elbow touches your left knee.
Step 2
Go back and forth, without lowering your legs.
How To Change Sides
Alternate sides after each rep. Both sides must be exercised to count one rep
towards the goal.
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一直到Step 2都還能理解，但How To Change Sides就不懂了。
這個運動不就是左手肘碰右膝蓋、右手肘碰左膝蓋，那麼「換邊」是什麼意思？
另外，rep是指完成「左手肘碰右膝蓋、右手肘碰左膝蓋」這一套重複動作的話
（repetition），當我做完上述動作，不就又回到「左手肘碰右膝蓋、右手肘碰左膝蓋」
的反覆循環了嗎？又如何能「Alternate sides」呢？
還有這句「Both sides must be exercised to count one rep towards the goal.」
是說左右邊各做一次，然後計算為一個rep嗎？
謝謝！
PS 本問題亦發表於https://goo.gl/N1Y7GG，希望能集思廣益，聽聽不同的看法。感謝！
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