and how an effect can become a cause of something else. The paragraph continues: ... Additionally, an increasingly sedentary lifestyle is a danger. Many tasks can now be achieved more conveniently ...

Correspondence to U Kujala, Department of Health Sciences, University of Jyväskylä, PO Box 35 (LL), FIN-40014, Finland; urho.kujala{at}sport.jyu.fi Evidence on the effects of exercise in the treatment ...

is one of the major causes of obesity. Exercise might not only help to improve their physical health, but might also improve their academic performance. This article examines the positive effects ...