Good form. For strength training especially, and swimming, form is very important, but it's also important for other types of exercise.

对于力量训练，比如游泳，方式很重要，但是对其他类型的练习方式也很重要。

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Anaerobic exercise (weight or strength training) helps form bone density and builds muscle that more efficiently burns calories.

FORBES: How To Stay Healthy