Try this workout and you'll find out why it's called In & Out. This is because you will be DONE and in and out with your workout in no time. Also, your lungs will be pushing air IN and Out a lot! Two large muscle groups in one circuit; that's bound to have you pumped.
If your goal is at the top of a mountain then keep on trekking until you reach it. Whether it's one step at a time or eight or nine, this circuit will save you time. Try these combinations to maximize your results in your core and arms.