Answer :

Gibbs
Basketball players must be flexible because basketball requires a high degree of mobility and finesse when moving around the court. In addition basketball players must be able to get low to play defense, and also jump high. Basketball players must also have strong hand eye coordination. 
Because having development abs and biceps isn't necessary for baseball players, that for football player, and also because major problem for the baseball players is the shoulder, they need it to be flexible that area.