"I believe that the solution to this problem is exercise, and those who would like to decrease their weight should try different sport activities."
What about eating healthier? That strikes me as a more effective and maintainable solution.
http://www.sciencedaily.com/releases/2012/10/121015142405.ht...
Though its a small sample and an extreme one at that, the contestants' diets accounted for approximately 65% of their weight loss.
For losing weight. For health in general, both seem about equally important. (And lots of exercise will allow you to get away with a crappy diet much easier.)
unfortunately, it's too easy to speculate on diets sitting on a chair.