The other important element to the class is twisting poses ‑- in a lunge, seated, pigeon pose and ankle-to-knee pose. Duyn explains that the twists massage organs like the pancreas, kidneys and liver that are working overtime to rid your body of those pesky toxins. During the stretches, the teacher emphasizes letting go of physical and emotional tension. As class winds down, you'll do your only upside-down pose, the shoulder stand, in which you prop up your back with your hands and point your body straight up in the air, feet first, with your neck, shoulders and head still on the ground. This stimulates the thyroid gland, yet another key instrument in metabolism. Finally, you finish with what Duyn calls a back-neutralizing position: a bridge/half wheel with all your weight resting on a block under your sacrum. After this, the sighs around the room are audible.

If you're not a Crunch member, you can get the same benefits from a gentle or basic hatha yoga class; you just won't get the specific references to your night of hard partying or that pounding head. While it's hard to prove that this will rid you of a hangover, and it's just as enjoyable if you skipped the booze the night before, Duyn offers a different guarantee: "Everyone is in a better mood when they're done." That should be enough motivation to get you out of bed!