Too much exercise can be bad for your health. There is a fine line between being committed to exercise and being dangerously obsessed: some people literally become addicted to exercise. Those annoyed the gym is closed on New Year's Day, or that they'll miss their 10km run because the relatives are coming over should read on. Over-exercising is hardly a nationwide epidemic. For many, just doing any is a major hurdle. But many amateur aerobic athletes - especially joggers, weekend triathletes and gym junkies actually overtrain, which can lead to burnout, injuries, chronic fatigue and a weakened immune system.
Also, the lifestyle that puts exercise first and family and friends near the back of the pack can become a major source of regret in years to come. Serious exercisers don't like being told they train too much, especially by those who don't train at all. Exercisers and non-exercisers are from different planets. So unless people keep tabs on their own (over)training, they might end up sore, sorry and sedentary. Dr David Pyne, a sports physiologist at the Australian Institute of Sport, says there are four key symptoms of overtraining to monitor: