I stick to machines for weight lifting as my shoulders are too weak to handle the dynamic motions of free weights. I'll be getting shoulder surgery in about a year or so to fix everything, and tighten them, so right now I do mainly physical therpay sort of exercises, just to maintain, and build a little muscle.
I do cardio three times a week at the gym, no less than 40 minutes, split between running, and then an equal length walk, or a shorter run, equal length walk, and some time on the bicycle. I alternate between chest/back and bi/tri exercises, and some abs on the machine, and when I get home, I do the rest of my abs.
I appreciate the help guys, and the good info.