I am a pretty healthy 27 yr old 5′4″ 133 lb. female. I try to change up my workout routines pretty frequently, for instance pilates one day, aerobics another, yoga another and weight/ cardio combos on others.
During my weight/ cardio days this is my schedule:
-cardio 20 mins. (either eliptical, stairsmaster, bicycle, or treadmill)
-upper body weight training 20 mins.(various Nautilus machines)
-cardio 10-15 mins.(either eliptical, stairsmaster, bicycle, or treadmill)
-lower body weight training 20 mins.(various Nautilus machines)
-cardio 10-15 mins. (either eliptical, stairsmaster, bicycle, or treadmill)
-abs occasionally for 10 mins. (pilates & yoga take care of that area ?)

Now, what i’m curious to know is, do you think it is better or more effective to focus on one muscle group each workout session? Is the full body not as effective, more effective, or does it really make a difference?