All of these activities require strength and endurance. Without adequate strength, even daily chores that we take for granted can be hard to do.
Many people lose muscle and strength with age.
However, most of this loss is due to inactivity. When inactive people grow older several things happen. Inactive people also have an increased risk of high blood pressure, diabetes, heart disease, thinning of the bones, and other diseases. Strength training, or weight training, can prevent and even reverse these changes. Overloading the muscle develops strength.