Get into a handstand with your feet flat on the wall. Do a push-up slowly controlling your descent until your head is close to the ground, at which point lift your feet off the wall to lower them to the ground.
triceps, chest, legs
triceps, chest, biceps, forearms, dorsals, shoulders, trapezius, core
triceps, chest, shoulders
quadriceps, femoral, buttocks, abs, obliques
legs, buttocks, calves, quadriceps