Reply To: U.S. Question, is interval for 50yd repeat length for 500 free too long? Home › Forums › General USRPT Topics › U.S. Question, is interval for 50yd repeat length for 500 free too long? › Reply To: U.S. Question, is interval for 50yd repeat length for 500 free too long? March 6, 2015 at 4:14 am #2378 billratioParticipant Oldschool, how do you figure out standard deviation? "Most people have the will to win. Few have the will to prepare to win."