Your Butterfly Rhythm Is Killing Your Stroke. That's Why YOU DIE after 25m/yd!

Why does butterfly exhaust you after 25 meters? You're swimming it with your arms only - no core, no body wave. This is the #1 butterfly swimming mistake I see with 90% of adult swimmers, and it's destroying your technique.

I'm Alex Coci, Olympic swimmer (Romania 2012, 200m butterfly) and technique coach at Ocean Swim School. In this video, I break down the 3 biggest butterfly mistakes that make the stroke feel impossible - and the specific fixes that'll make butterfly actually sustainable.