Welsh Dragons

Stay in the plank position the entire time. Bear crawl forward 4 steps, then do 1 merkin, 1 plank jack, and tap the back of each shoulder once. Repeat, adding 1 rep to each exercise each time—bear crawl forward 4 steps, then do 2 merkins, 2 plank jacks, and 2 shoulder taps. Continue until you reach 10 reps of each exercise, have covered 30-50 feet, or until your arms give out—whichever comes first.