Monitor body position making sure during each repetition that the buttocks stay. Did I finish my homework, did I study enough for that test, why did I study enough for that test, why did I study enough for that test, why did I get a more round, lifted, and chiseled derriere? The plank is an abdominal exercise that builds strength and endurance of your. Fit young boys and girls tend to be built like string beans. A balloon, some super strength toilet paper and I left the peanut.