It's so sadly common. Being chosen as a sports coach is like the equivalent of marriage for MtH's (male to hams). They maintained a humanoid form temporarily out of necessity, but they are just waiting in the woodwork for their opportunity to give up on themselves. As soon as the first team decides to make a commitment to them, the lard in question sees it as the go-ahead to discard every ounce of physical discipline that got it to that point in the first place. It's like they just say "wooo I'm a coach, now I can get FAT!"