摘要
1 It's important to exercise at any time of life,but our fitness needs change with the passing decades.Most people reach their top bone mass between 25 and 30—so this is the time to focus on high-impact weight-bearing activities that will build the bone-bank needed to decrease the risk of breakable bones in later life.Activities such as weight training and skipping—which stress the bones with additional weight,or impact—are the best way to build bone density(密度).
