In the latest Our Bodies, Our Lives column by UTMB’s Dr. Tristi Muir: Building and maintaining the health of our 206 bones should be a lifelong goal. By 20, women generally reach their peak bone mass. That means it is crucial for young women to build strong bones with physical activity and adequate calcium intake in their youth. To stimulate bone growth and health, exercise should include weight-bearing activities such as running, jumping, soccer, basketball and tennis. The impact of working against gravity stimulates bone growth and increases muscle strength.