Free style means that the swimmer is allowed to swim by any means, arbitrarily changing them at a distance. The exception is complex swimming and combined relay race, in which the free style is any other way, except for the way of swimming on the back, breaststroke and butterfly.
The swimmer must touch the pool wall with any part of the body when turning and finishing.
Any part of the body of a swimmer must tear the surface of the water during the swim, except for the permission of the swimmer to be completely submerged during the turn and at a distance of not more than 15 m after the start and each turn. At this point his head should break the surface of the water.
Swimming in a way on the back
The rules of swimming competitions for 2013-2017