How can I adjust the player's body type in a script?

Game settings is broken for me, when I try to save them the window freezes and I have to force close studio. I was wondering if there was a way to change the player's body type, which is the slider bar under your avatar when you go to adjust the scale for the R15 body type. I want all of the players to have the 100% body type as it is more proportionately realistic. Any help would be appreciated, thanks for your time.