What are those coloured strips and why do they work?

“The Kinesio® Taping Method is applied over muscles to reduce pain and inflammation, relax overused or tired muscles, and support muscles in movement on a 24-hour-a-day basis. It is not a restrictive type of taping and allows for full range of motion. In contrast, traditional sports taping is wrapped around a joint strictly for stabilization and support during an athletic event. Kinesio® Tex Tape is used to treat anything from headaches to foot problems and everything in-between.”

kinesiotaping.com/about/kinesio-tape-frequented-asked-questions/