In conclusion, walking is a cheap, safe, enjoyable, and readily available form of exercise.
综上所述，散步是一种廉价、安全、有趣而又随时可以开展的运动形式。
Is it safe to start exercise after you are pregnant?
在怀孕后运动是否安全？
The exercise intensity was the key point in ensuring safe and effective exercise prescription.
运动强度是运动处方安全而有效的关键所在。
For most people, exercise is absolutely safe.
对大部分人而言，做运动是绝对安全的。
For most people, exercise is absolutely safe.
对大部分人而言，做运动是绝对安全的。
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