You never truly understand what the lack of physical activity does to your body until after some time has passed from neglecting it. You do not have as much energy, and you are weaker from your muscle mass shrinking. The principle is simple: if you lead a life that does not involve using your muscles often, then your muscle mass is reduced. It is time you turn to weight training and exercise. What Lack of Exercise Can Do to You If you count the individual muscles that exist in your body, you would get to 650 and then some. You …