Power Pedal Start is something they taught in Bike Pro, where you straddle the bike, put the pedal in the up position, and as you step on the pedal, the bike moves forward and you sit on the seat, all in one smooth move.
Similarly when you stop, you put the pedal in the down position, as you come to a stop you stand up off the seat and put your other foot down to the ground, again all in one smooth move.