I have never pulled a muscle or a tendon, but I remember that I had a lot of bruses when I were younger, because of the bycicle in Grany's dacha. And I think I will have more bruses, because I still like to ride a bycicle on summer hollydays. I sometimes have headaches, but this is depends on the season, and I have never had anything more serious, like migraine or astma. I often feel over-tired, because I do not sleep enough. To keep healthy I do regular exersise and try to follow the diet. In my opinion, the most dangerous diseases in my country are probably cancer or something caused by alchohol because a lot os people drink too much.