Start out with push-ups. You can control the muscles you work by moving your arms....you work your chest if your arms are spread wide, triceps and shoulders when they are close together.
Make sure you keep a good posture, to get the maximum effect and reduce stress on your back. Keep your back straight, feet within 12 inches of each other, and look out, not down. Remember to breathe as you exercise! (can be harder to do than you think!)
The best way to initially build up is this:
30 seconds of PU (put you knees on the ground if you can't do any more straight PUs, but KEEP GOING the whole time)
45 seconds of resting....repeat 3-5 times.
After you are able to do PUs for all 30 seconds of all the sets, lower your rest time to 30 seconds.....after you can do that, 15 seconds, and after that you're doing 1.5-2.5 minutes of PU straight!!!
It takes TIME, and you must keep doing it.
Body-weight resistance exercises are a good way to build yourself up. Push-ups, pull-ups, crunches, flutter-kicks, knee-benders...good stuff!!! Make sure you work cardio as well by running, get a good pair of shoes....check out coolrunning.com for a real good start-up running program.
Good luck! Have patience with yourself, and DON'T QUIT. You might not see results for months, but if you feel the burn it's working!!!
-james
RIP Officers Shelton and Clark, 3/31/07
"What we have done for ourselves alone dies with us. What we have done for others and the world remains and is immortal."