Mom likes to exercise before often climbed the mountain but now even square dance are not able to jump, we say eat some what can be good for the body ah?

I don't know how old your mother is now. If really old, it is a natural phenomenon, eat what is useless, people old first old legs. If you are not old, you can drink a little more milk, eat a little calcium tablets, strong bones of the elderly. This is good for the legs. Usual diet should also pay more attention to nutritional balance, eat less high-calorie high-fat things. Eat more vegetables, fruits and vegetables. Because people are too fat, the knee can not withstand the pressure, but also hurt the knee. Finally, I wish the elderly a long and healthy life!