Quick note on Incidental Contact in Ultimate Frisbee: intentionally leaning into other players is flat-out cheating.
All players must attempt to avoid contact with other players, and there is no situation where a player may justify initiating contact.(Rule 12.9, WFDF)
It is the responsibility of all players to avoid contact in every way possible. (USAU 11th)
According to the 11th Edition Rules, incidental contact is defined as contact between players that does not affect continued play. For example, contact affects continued play if the contact knocks a player off-balance and interferes with his ability to continue cutting or playing defense.(USAU 11th Edition Section II.H)
It follows that if you are trying to get a better position on the disc by leaning/pushing/shouldering/bodying or otherwise purposefully moving another player you are committing a foul.
Furthermore, each player is entitled to occupy any position on the field not occupied by an opposing player, unless specifically overridden elsewhere, provided that no personal contact is caused in taking such a position. (USAU 11th Edition Section XVII.A)
Sources USA Ultimate 11th Edition Rules
WFDF Rules
(under Official Interpretations)
