I'm 5'8" and 142 lbs. I won't say I'm in wonderful shape, but I'm enrolled in a military fitness class at my college that's starting to get me that way. Where I'm still not able to catch myself up on is the pushups and pullups categories. I can get maybe 20 chest touching the ground and back up pushups in about two minutes, but the standard sits somewhere around fifty. Ideally, I'd like to be a little past that eventually. Pull ups, I can't do period unless there's someone holding my legs below. What sort of excercises should I be doing to increase my upper body strength so I can improve in these areas? I know it's no overnight thing, but I'd really like to be able to get this eventually. Thanks for any advice.