骨密度代表骨的强度，骨密度依随体重和负重锻炼而相应升降变化。
Bone density contributes to the strength of the bones; and their density changes in response to body weight and to weight-bearing exercise.
任何锻炼项目都需要在有氧运动和负重练习间取得一个平衡。
Any exercise program needs a balance of both aerobic and resistance exercises.
为了能使用这些技能，特殊的要素成为必须的，如衣服和负重。
Specific elements are required, such as clothes and inventory load, in order to be able to use these skills.
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