Just thought I'd add a quick bit here. Working out without weights (or at least without doing the normal repetetive repetitions) is a very GOOD idea!
For example: a guy who went to the gym for many years was what you would call a large muscled body builder, and he offered to help my grandpa and father put in a large/heavy window, however because of only lifting weights -- many 'useful' muscles are avoided... needless to say he was unable to lift this window up and over his head into the hole... who would have guessed it.
There are many other examples of this. Your muscles all work together, so unless you work on ALL of them, you may look strong.... but really you might not be... except in the exact movements as you lift weights.
Freeweight movements / body weight workouts are very good for all around strength building.
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