I think it is particularly important for young girls and boys to exercise in order to build stronger bones to prevent osteoporosis later in life, because most people reach their peak bone density and strength in their teens and twenties. After peak bone mass is reached, bone density remains stable during adulthood and then declines with age. Weight bearing exercises are essential for building bone density and mass. However, to obtain bone benefits, exercise must be regular.
The International Osteoporosis Foundation (IOF) is a global movement for change. Through our national societies we are active around the world raising public awareness of bone, muscle and joint health. Initiatives include the organization of World Osteoporosis Day (October 20), the Capture the Fracture campaign, and outreach projects such as snap! the breaking spine.