Each of these drills can be done with variations that increase the level of difficulty. The drill should be done as described for the lower skill levels until the players can skate reasonably well. To increase the difficulty, have the players alternate between skating forward and backwards between each line. An other difficulty increase is to have the players always face the same direction while braking. This will force the players to stop on both sides rather than favor one side (as most players do when starting to skate). To increase player conditionning, doubling the each step is quite effective (or immediately skating the drill a second time without rest).
Although these drills are aimed at skating, pucks can be given to the players in order to practice puck handling while skating and stopping. This may be motivation for younger players but should be avoided for higher levels as it will distract them from skating at maximum capacity.