Here are some pictures from the lesson.
Terri with good wheelie form – arms extended and torso upright
Terri rolling the drop – around 15″ high, about as big as possible without chunking the chainrings
Mark rolling the drop – arms extended and weight back
Mark working on going up – in this one his weight is too far back, and the pedals aren’t level. The chainring will hit the wall by the time he is ready to spring up and unweight the bike – and his hips are too low.
Terri with another common mistake – she has absorbed the upward movement of the bike with her arms. Her body is moving forwards but not up.
Mark with much better form – pedals level, legs extending as his hips are already moving upwards. He used the wheelie to get his body moving upwards.
Terri gets it figured out! Hips moving up and pedals coming around to level. Spring like a cat and that back wheel will float right up!