Which one of the following correctly describes a reason for muscle atrophy,
a) inability to continue training,
b) regular participation in weight training,
c) too much protein in the diet,
d) a build up in lactic acid

The reason that correctly describes muscle atrophy is option a. inability to continue training. Muscle atrophy is defined as the loss of muscle tissue. This happens because of the absence of activity in the muscles. This is usually a result of acquiring a disease or injury that hinders that specific part of the body to perform an activity.