<P> Crunches are executed while lying on the back with the feet flat on the ground together or 12 inches apart (whichever is more comfortable), knees bent at a 90 degree angle, and arms on the ribcage or chest . One crunch is completed when the upper body is lifted until both arms touch the thighs and then lowered until the shoulder blades touch the ground . The arms must be in constant contact with the chest or rib cage; the buttocks must be in constant contact with the ground . The exercise is performed with the heels of the feet kept in constant contact with the ground . The Marine is given two minutes to complete as many crunches as possible . </P> <P> The Marine runs three miles on reasonably flat ground . (Actual distance may vary slightly .) The 3 miles is approximately 5 kilometers . </P> <P> The scoring for each part of the test is dependent upon a Marine's sex and age group . </P>

How many pull ups do you need to do in the marines