One way to effectively strengthen bones is to balance your weight on them. Hand and feet balances practiced in hatha yoga do this...and are especially designed to keep flexibility and mobility of the spine as we age. The yogis were scientists ... and we can age gracefully if we only practice some really helpful exercises every day.

Try this: arrange yourself in a "High pushup" position, spread your fingers and breathe deeply 5 times in and out of the nose. There's an easy hand balance for you!