On March 22,the Tuesday of the first week,I started on my weight loss program.That evening I bet with roommate do 50 sit up,people who fail should pay others for a free meal.To tell the truth,I had not done this kind of exercise in PE class in high schoo lfora long time since I did sit up.My roomate helped me hold the feet,I initially did very fast,when 20 is sort of tired,almost did not come,but the thought of failed people to dinner,I kept going,and finally finished the 50.