GermanSportmuffelLit. sports grump: someone who does not like / rejects exercise and doing sports.

Usually it rrefers only to the exercise oneself does not. You can have the sports channel running 24/7 and still be a *Sportmuffel*. You also don't have to be a couch potato, you cna be outgoing and socially and culturally active, and still be a *Sportmuffel*. Does your language have something that comes close?