CNN CNN Newsroom January 4, 2014 23:22:00
Score perfect because so few passed, the marines will let them choose to hang on the bar for 15 seconds and pass without doing any pull ups. >> wide grip works best for you. >> reporter: they admit pull ups are better than the flexed arm hang elicits little muscle strength for military tasks such as pulling yourself over obstacles and other equipment. she is a former marine corps officer who commanded troops in afghanistan. >> could you do three pull ups? >> at one point, i could do fife. the first one took the longest to get to. >> reporter: women have to learn how to do a pull up. >> experim...