Exercise is necessary for strong bones and both heart and lung health.
锻炼对强健骨骼和心肺健康都是必要的。
2
Weight-bearing exercise helps keep bones strong and less likely to fall prey to the body’s own mechanisms in later age.
负重运动能够使骨骼强壮，在老年时期就不会为人体自身机制所折磨。
3
If you do a good deal of low impact exercise, such as walking, you will certainly lose fat but you may not be able to put enough stress on the bones to build them significantly.