Q: What are the ways a defender push the opponent out of the key legally and is it okay to use the lower body to push the offence out?
A; In all of the above cases, it is not legal to push an opponent. Here is the official Article from the current FIBA Rulebook:
33.15. Pushing
Pushing is illegal personal contact with any part of the body where a player forcibly moves or attempts to move an opponent with or without the ball.
A; In all of the above cases, it is not legal to push an opponent. Here is the official Article from the current FIBA Rulebook:
33.15. Pushing
Pushing is illegal personal contact with any part of the body where a player forcibly moves or attempts to move an opponent with or without the ball.