Frequently Asked Questions - Stance
Yes. The phrase “part of the player’s body” should be interpreted to include not only clothing but also mobility devices such as canes or crutches (as long as they are providing support).
Holding on to something behind your lie for support is not prohibited by the rules, provided that the object is in-bounds. It also must not be moved, since you are required to take the stance that results in the least possible movement of obstacles on the course. You are not allowed to hold onto another person for support, as that person is not part of the course.
Yes. Inside the culvert is not a playing surface, but the hillside above it is. If the TD has not provided guidance on how to handle discs entering these culverts, then players can mark on the hillside directly above their disc with no penalty.
Yes, that is allowed. Your stance was legal when you released the disc, and you did not go past your lie (closer to the hole) after releasing.