Strength-to-Mass Ratio (S-M R) is the force a person can exert divided by their mass. It is typically used in correlation with functionality; it is primarily of importance to people concerned with improving the ability to manipulate their own body (gymnastics, rock climbing, martial arts). These people should focus on exercises that increase strength-mass ratio, whereas bodybuilders, for instance, do not concern themselves so much with S-M R because the priority is more increase in bulk. S-M R is also beneficial for older people looking to enhance their lives through fitness.