Lisa Ryckman

The nation's recliners, lounge chairs and overstuffed sofas are full of them – the lumpy, the lethargic, the barely mobile. The inactive, the unfit, the workout-opposed, the yo-yo dieter, the anti-exerciser. So ubiquitous, and yet so difficult to catch (they aren't fast, but they can be slippery) and even harder to keep. Sure, a beginning yoga or Pilates class might lure them in, but ho…