1. Combined with chuanzhang. Koubu, baibu, step through to chuanzhang. Turn around to the rear with a baibu, rolling through the chuanzhang to settle into a mabu, turn to a high block and yezhang. You almost roll under the chuanzhang arm, so it stays up in the high block. In this drill, the high block is well behind the head, not in front.
2. Stepping. Do the same drill, but with a more random stepping pattern. Go back and forth, around and change directions.