It's fall. Which means winter is right around the corner. If you've been slacking on your lunges and squats at the gym, don't fret. We have the ultimate miracle training device for ski conditioning. And the best part? You can train while watching tv. That's right, you heard us: Get ready for ski season and watch Monday Night Football at the same time. How does this miracle work, you ask? It's called the wall sit. Or, in this case, the tv sit. You can eat even chicken wings or drink beer while performing this quad-booster. Here's how: Prop your rear against the wall, bend your knees at a 90 degree angle (knees should be directly over your ankles), and stay put. For as long as you possibly can. Until your quads quiver like a sewing machine. Until they feel so weak and noodle-like, you collapse onto the floor. Then take a minute-long break and do it all over again. The best challenge is staying put for the duration of the commercial break.