Digging holes for planting, pushing around your lawnmower, pulling weeds, and the many other movements that yard work necessitates provide the weight-bearing exercise needed to strengthen your bones and prevent osteoporosis. An added bonus to gardening is the effect of being outdoors. Fifteen minutes of sun exposure daily gives you all the vitamin D your body requires.
Before you work in your garden, walk around and warm up your muscles just as you would before exercising. Remember to use sunscreen if you plan to be in the sun for more than fifteen minutes. Then enjoy all the fruits of your labor!