Ukemi as both a way to warm up for class and work on analyzing any trouble spots of movement.
Places where one might be a bit sore or not as limber- targets to hit with some junan taiso.
Rolling using the hands as a guide, both of them to help balance on the way down and up back into kamae.
Switching to using one one hand, followed by using no hands.
Rolling holding something in the hands, a training tool, hanbo, jo, or bo.
Practicing leaping and rolling using two hands, one hand, and no hands.
Leaping into the roll, and picking up something off the ground before standing back up into kamae.