Okay, so I am 16 years old (nearly 17, I turn 17 July 21st), I am 6 foot exactly and weigh a measly 148 pounds and according to my scale I am 13% body fat. I'm really wanting to begin working out but I live with my mom at the moment and she won't buy me anything to do so with. She sold the weight bench to someone a little while ago, and she won't buy a new one. We don't have a treadmill, elliptical, or anything of the sort. We don't have any dumbbells either, so basically I have none of the materials for me to begin working out and it really gets me down. I don't have any bar around that I can do chinups on, or anything like that. Whenever I do push-ups I can do maybe four or five and then I begin to get a great pain in my elbows and shoulders and wrists, and my arms shake vigorously. I eat rather healthily, and drink several cups of skim milk a day. I longboard for a few hours daily as well. I don't have a pool so I can't do any training in a pool either. I'm really in a ****ty situation...does anyone have any suggestions as to where to start out? And does anyone know why doing push-ups is so strenuous for me? My head also begins to hurt when I do push-ups...