I know many players wear sweat bands, but what are the other kind of band that pros wear? I saw Sun Jun put one on when he had a cramp or something (against Peter Rasmussen). How does the band work? He was also spraying something on his leg (same match against Peter Rasmussen, game 3), what is that and what does it do? More often I see players' legs, arms, or back taped up. What kind of tape is that and how does that work? For example Lin Dan had his waist taped up in AE2006 finals.