One of the outstanding benefits of resistance exercise, as it relates to weight loss, is the positive impact of increasing energy expenditure during the exercise session - and somewhat during recovery - and on maintaining fat-free body mass while encouraging the loss of fat body-weight. 

As people get older, osteoporosis tends to become more of an issue due to losses in bone mass density. Many people try to offset this problem by taking calcium supplements. However, extra calcium is only beneficial if the body absorbs it, and the body will only absorb it if there is a stimulus to do so (i.e. a stimulus to increase bone mass density).

The most powerful stimuli for increasing bone mass density includes activities which put significant stresses on the bones, and resistance exercises are among the most effective of these.