Tolerance: the need to increase the exercise duration, frequency and/or intensity to perceive the desired benefit and to satisfy 'cravings' for it

Fluctuation in amount of exercise as expected at various points in the training cycle

Withdrawal: depressive or anxious symptoms or irritability when the individual suddenly reduces or stops exercise, with possible difficulty performing professional or social activities as a result of these symptoms

Mild depressive or anxious symptoms or irritability are possible when the individual suddenly reduces or stops exercise, but these symptoms do not cause functional impairment

Continued exercise despite knowing that it is causing physical, psychological and/or social problems

Ability to stop or cut down on exercise as recommended (eg, if an injury or illness could be worsened by continued exercise at the same level)

Inability to reduce or manage exercise, despite the desire to do so

Feeling of control over exercise, which occurs according to planned training

Elimination of other life activities (eg, previously desired social, occupational or recreational activities) to accommodate increasingly time consuming exercise regimens

While exercise may take a substantial amount of time, other life activities that are important to the individual are not completely eliminated