rechost if
(1) you must be doing the head-turning animation. This excludes standing on toxic gas, standing in quicksand, and having low health.
(2) you cannot be in a cold course. This includes CCM, SL, and WMotR.
(3) you cannot be standing on an object. you must be standing on a floor triangle that's part of the course geometry.
(4) The floor height 60 units behind you must be within 24 units of your height.