3.01 Lifetime Fitness

Teen years
Explanation: As it depends on many factors, including age, lifestyle, diet, and overall health. However, it is generally recommended that people start taking steps to improve their bone health as early as possible, as this can help prevent osteoporosis and other bone-related conditions later in life. Some simple ways to improve bone health include getting enough calcium and vitamin D, exercising regularly, and avoiding smoking and excessive alcohol consumption.

Throughout life
Explanation: There is no definitive answer to this question as everyone's fitness goals and abilities will differ. However, generally speaking, someone should focus on muscle strength when they are trying to improve their overall fitness level or tone their muscles. Strength-training exercises help to build muscle mass, which can in turn lead to increased strength and endurance.

The child will continue to exercise throughout life.
Explanation: If a child develops regular exercise habits, they may likely develop healthier habits later in life. Exercise has been linked with reducing the risk of developing chronic diseases such as heart disease, stroke, diabetes, and cancer.

Loss of density
Explanation: Low bone mass can lead to osteoporosis, a condition in which bones become weak and fragile. Osteoporosis can lead to serious health problems, including an increased risk of fractures.

Reduce symptoms of arthritis
Explanation: Push-ups can be used to build muscle and improve strength in the arms, chest, and shoulders. They can also be used to improve core stability and posture.