The day after Billy's Muay Thai fight, I was feeling a little under the weather and by Monday I knew it was full-blown sickness coming on. Sniffles were giving way to a sore throat, and eventually the inklings of a cough appeared. By Wednesday, I was feeling really gross but I knew I couldn't miss a workout with Sandy. One of the girls in the group training, Sam, was also feeling sick. The two of us groaned and wheezed our way through lunges and squats. We passed each other clean tissues, and...