Time to circle the troops for this special announcement: ditch the circles for squares if you want to feel more burn. Women who want to tone their muscles often take to making circles with their legs and arms. While this is certainly a worthwhile activity, it helps to slow down and make square motions instead.
The four brief pauses will make your muscles work a bit harder and cause a deeper burn. Just give it a shot and you'll see it's a tad tougher to round the bases than ease your way into circles. If you just can't give up the orbs, try to slow it down and be more aware of the muscles at work.