If all you have on hand is light weights, remember that lifting a light weight 1000 times is not strength training and won't help your bone density.

When you challenge yourself to pick up a heavy thing and said heaavy thing is challenging enough that you really really wanna stop after 5-12 or so repetitions, and then, after a short rest of 30-60 seconds, you can agree to give that another go or two, this is where the change comes. By working hard like this, the muscles are forced to grow, and, in turn, the bones also need to step up to support the new demands being placed on them.

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