From the USA Swimming office: To avoid risk of serious injury, no swimmer who has not been properly trained should attempt to perform a racing start, from either a starting block or the side of the pool, into less than six feet of water. USA Swimming has implemented a racing start certification program where a swimmer’s coach documents his or her professional judgment that a swimmer has demonstrated sufficient skill to safely perform a racing start into four feet of water in competition. There are rare occasions when swimmers may participate in swimming competitions not under...