When you're stretching, keep it gentle. Breathe freely as you hold each stretch. Try not to hold your breath. Don't bounce or hold a painful stretch.
在伸展时，要保持动作柔和，在保持伸展状态时自主呼吸，试着别去控制呼吸，不要做弹跳动作或者做会产生疼痛的伸展动作。
This makes breathing difficult and painful, and can also limit the amount of oxygen a person takes into their body with each breath.
这使呼吸变得困难且痛苦，并且会限制每次呼吸时进入人体的氧气量。
Especially if you have to ride the bike up the hill, where you are short on breath, a full load of "truck air" feels very painful inside your body.
特别是骑上坡的时候，上气不接下气，满载的卡车排放的尾气让人感觉痛苦。
Especially if you have to ride the bike up the hill, where you are short on breath, a full load of "truck air" feels very painful inside your body.
特别是骑上坡的时候，上气不接下气，满载的卡车排放的尾气让人感觉痛苦。
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