Question

choose four things you can improve by regular physical activity. vision heart strength muscle strength bone density respiratory function diet

Explanation:

Regular physical activity strengthens the heart (cardiovascular system), builds muscle strength through exercise, increases bone density (especially weight - bearing activities), and improves respiratory function (lungs work more efficiently). Vision is mainly related to eye health (not directly improved by physical activity in most cases) and diet is related to nutrition (not directly an outcome of physical activity itself, though they are often part of a healthy lifestyle together).

Answer:

heart strength, muscle strength, bone density, respiratory function