Sterling has been quite troubled recently.
Because he's noticed his butt is getting bigger and bigger.
At first, 21-year-old Sterling thought it was just normal muscle growth.
For a player of his age, although his height won't develop anymore, his muscles haven't reached their peak yet.
Generally, it's around 24 or 25 when muscles gradually finish growing, reaching a player's strongest period.
But too much of a good thing can have the opposite effect, and an overly large butt has caused some trouble for Sterling on the field.
First of all, he feels his body coordination is off when running.
As Sterling runs, he always feels like there's a rock pressing on his butt;
He wonders whether to lean left or right, or whether to run with his butt stuck out or tightened, never feeling comfortable.
