Hi,
36 years ago, I competed in butterfly and backstroke, and my breaststroke was severely slow. I've returned to swimming for about one year and now is as fast in freestyle as back then. However, my breaststroke is now faster than backstroke and butterfly is the slowest of the three. The 100m pace of my breaststroke now is faster than my 1k freestyle, which is surprisingly satisfying (for me).
What does this physiologically indicate? I just look to see what are missing for swimming butterfly and backstroke.
Thanks