1. Mabu stance, yezhang to one side, with upper block. Turn the leading palm up, bring the rear hand to slide under it, then turn the rear arm to jia (block up) and rotate the leading palm to yezhang.
2. Mabu stance, yezhang very low side to side. Sit in mabu and repeat yezhang with one hand, with the rear hand extended to the side to support the force. This can also be done with a small shift forward into the yezhang.
3. Mabu stance, alternating side to side yezhang. Sit in mabu with both hands in yezhang position. Repeat, alternating side to side with very little extraneous movement. Find the power deep in the lower back. This should be done casually, just letting the hands stay low.