Uhm, ever heard of compound movements? Deadlift, Squat, Benchpress, Power Clean, no name a few. All stresses multiple, if not all of the muscle groups.
Where did you get the BS idea that free weights only isolate muscles?
Btw, kettlebells would be my preferred choice if you wanna start lifting again. Read Pavel's Enter the Kettlebell for some serious pain >:)
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