Here’s the other key component to good bone health: exercise, in any form. Bones, like muscles, respond to stress. As the saying goes, if you don’t use it, you lose it. When we don’t actively load our skeletons, calcium begins to leak from bones. Thankfully, just 20 minutes of weight-bearing exercises a day like walking or lifting weights, can help maintain or even increase bone mass (though increases are likely minimal) according to Anderson.