[j_horvat]

Avid LoL scene follower checking in, most players are in fairly good shape. With the scene getting more serious and professional most teams are getting coaches that mandate healthy diets and exercise as part of a team's training, since you know healthy body healthy mind. So while the game might not be that physically intensive (though it definitely can be really stressful) most players do at least undergo some kind of physical 'training'.

Obviously differs from team to team and there are some overweight pros as well.

[ChessPlayer]

That still doesn't make LoL an athletic sport (a sport that requires athletic capability), it just means some athletic people play LoL.

I'm athletic and I play chess, but chess is not an athletic sport.

  ath·lete [ath-leet]

  A person trained or gifted in exercises or contests involving physical agility, stamina, or strength; a participant in a sport, exercise, or game requiring physical skill.

  http://dictionary.reference.com/browse/athlete?s=t

[j_horvat]

Totally agree sorry if that came across differently in my comment :)