Watching televised sports, especially American Football and Basketball, it seems that whenever a player falls or is knocked down, he needs help getting back up. With football, it is somewhat understandable, since they wear pads that get in the way. But for a basketball player, it seems trivial to stand up, yet I often see players sit on the court until another player offers them a hand up.
Is there a reason for this? I understand that one reason might be a form of team camaraderie. But is there any other reason? Is it difficult for the downed player to stand on his own?
Edited to add
I understand the sportsmanship element in helping an opponent (or teammate) up.
But today I saw a college basketball player sitting on the court, long after most other players were moving on, waving at teammates to come over and give him a hand up. It wasn't an act of sportsmanship, it seemed more like he needed help simply to stand up (and no, he wasn't injured). I actually see this quite often and it always puzzles me.
As I said, I can understand it in football due to the pads they wear affecting mobility when on the ground, but that isn't present in basketball. I don't really watch any other sports, so I don't know if it is prevalent anywhere else.