Peter Parker (and Parker Peter)

In plank position move left knee toward left elbow with foot flared out.. then flapjack. You should look like Spider-Man climbing a wall. For Parker-Peter, simply pull left knee across your body to the right elbow. For an added twist Peter-Parkers can be combined with Merkins, so that when you go down you bring your leg in, and then straighten the leg as you return to plank.