Individual movements of the form practiced with fajin on a moving line- this can be pung- ward off, lu- rollback going backward, Ji- press, An-push, repulse monkey- backward. We learned it (Weiqi He, student of Fu Zhong Wen) with including a jump step as well similar to Hsingyi but not a 'San ti' stance a more Taiji front weighted stance. There was one exception that was for a back leg weighted stance like repulse monkey or Lu/rollback.
http://www.youtube.com/watch?v=YvL4s7TElEU