I'm not that physically fit, I want to change my metabolic rate and improve my fitness. I already follow a fairly healthy diet. I need to know if there are any exercises for core and lower body I can do at home without specialist equipment. I'm not very fit- I can usually get up to about 35 ab crunches in one go in the evenings, usually when I'm quite tired. 5 minutes later I can do another 15, and I keep going like that until I run out of energy and just fall asleep. Also, how long does it take to see results? I've been trying to do crunches every night for three days (fell asleep in the middle of it last night, my abs were quote sore all day and it wore me out) and i've lost about 2lb. I walk to school every day, about 1.5 - 2 miles. Suggestions and stuff would be appreciated. :D