Jogging, jumping rope, or playing tennis 30 minutes a day, 4 days a week would be most helpful in maintaining healthy bone mass.
Bone mass is a way to calculate how many minerals—mostly calcium and phosphorous—are present in a given amount of bone. Measurements of bone mass are used to identify osteoporosis (a disorder characterized by decreasing bone mass), assess the efficacy of osteoporosis treatments, and forecast the likelihood that the bones may fracture.
Your bones are constantly being renewed; new bone is being formed, and old bone is being destroyed. When you're young, your body builds new bone more quickly than it destroys old bone, which results in an increase in bone mass. This process slows down after the early 20s, and most people reach their peak bone mass by the age of 30.
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