A dear friend of mine, with whom I worked with for several years, loved to use hula hoops in her training. She would always say ‘It whittles the waist!’. So anytime there’s a focus on a twisting motion from the waist, I can hear her enthusiasm  for whittling. Lol

Not only do these 2 exercises work your range of motion (ROM), they will also benefit your balance, work your transverse abs (the ones that wrap around your spine), and yes, whittle your waist.