on your toes

one of the ways to add the legs and knee bend to your serve is to get your heals off the ground and get on your toes

reach and drive

on the volley you want reach for the hit so your contact is in front of your body and drive it to the target

squeezed I

on squeezed I the server goes near the middle to serve– his partner is in regular posture very near the middle– the net person will break either left or right