The arm must be free to move in any possible position. That means overhead, to the right, to the left and any possible angle in between.
Why is it than that so little stretching is done in badminton training. Well, it's not. While most high school students and weekend warrior, just run a few laps and go into the game, in college and in the pro's things are done differently. College players usually undergo at least some stretching programs. Professionals often do trainer or therapist assisted stretching.
Top players are very valuable to the country or organization they play for. For this reason they receive the best training. This includes stretching. Due the unpredictability of badminton, the players arms can be in any possible position. If the range of motion is not there, points could be lost or worst. A player can injure the shoulder. For this reason flexible shoulders are a must.
Our program develops quick badminton specific shoulder flexibility. At the same time, strength exercises are included. These exercise help to retain the flexibility and protect the shoulder in vulnerable position.