When swimming freestyle or backstroke, each hand entering the water is counted as one stroke; In breaststroke or butterfly stroke, extending both hands forward once counts as one stroke. Swimming without counting the number of strokes is like driving without a speedometer. Calculating the number of strokes indicates that you are not blindly swimming. Therefore, for 99% of swimmers, calculating the number of strokes is far more important than calculating time. Finding the number of strokes that belong to you will make your swimming more proficient.