Convict Conditioning was a nice book to introduced me to calisthenics. I would suggest calisthenics, just be sure to not neglect any muscle group and to start slow. Better to slowly progress and not hurt yourself doing something you weren't ready for or burn out and end up not working out consistently. Working out shouldn't be a chore that you rush through, it should be an activity that you savor.
Video with many beginner-expert level exercises:
http://www.youtube.com/watch?v=POdzasJklxw
More indepth tutorials:
http://www.youtube.com/playlist?list=PL7...re=mh_lolz
Don't forget about cardio either!
Even if you typically just do weights, or X style of exercise, it is always good to switch it up every so often.
In the end, unless you are trying to be a body builder, all that really matters is that you work out consistently.
Video with many beginner-expert level exercises:
http://www.youtube.com/watch?v=POdzasJklxw
More indepth tutorials:
http://www.youtube.com/playlist?list=PL7...re=mh_lolz
Don't forget about cardio either!
Even if you typically just do weights, or X style of exercise, it is always good to switch it up every so often.
In the end, unless you are trying to be a body builder, all that really matters is that you work out consistently.