only need a half or one yard. They can sneak it, they can hand off to quick hitting dive or jump over the pile, play action, etc. I also like in short yardage having a fullback or even go with the T backfield power run. Being in shot gun with one yard to go is just stupid as it takes too long for the play to develop and depends on near perfect execution or your result is the QB or RB getting tackled in the backfield for a 4 yard loss.