“Keeping your muscles healthy will help you to be able to walk, run, jump, lift things, play sports, and do all the other things you love to do. Exercising, getting enough rest, and eating a balanced diet will help to keep your muscles healthy for life. Strong muscles also help to keep your joints in good shape. If the muscles around your knee, for example, get weak, you may be more likely to injure that knee. Strong muscles also help you keep your balance, so you are less likely to slip or fall.And remember—the activities that make your skeletal muscles strong will also help to keep your heart muscle strong! ”

National Institute of Arthritis and Musculoskeletal and Skin Disease (NIH https://www.niams.nih.gov/health-topics/kids/healthy-muscle)