dedicated to the discussion of the chinese internal martial arts of xingyiquan, baguazhang, taijiquan, related arts, and anything else best discussed over a bottle of rum
Forces start at the dantien and sink to the ground (internally - there's no big stamp), where the force then appears in the hands instantaneously.
Check out this video of the old man at 1.10 when he sends force down then out to both hands simultaneously. Years of practice there to make it look so minimal and effortless.