I've been trying to swim 400 m in under 10 minutes for some time now, and I keep end ip being 30 seconds over. I notice that when I'm swimming freestyle, when I try to initally atart with breathes every 3 strokes, I can do it for 2 laps. After that though, I feel a bit of a tightness in my chest and start feeling really dizzy, where I then eventually devolve into desperate gasps and forceful swimming. I heard before that swimmers often breathe in too much resulting in CO2 buildup, but when I tried to take smaller breathes (still exhaling underwater), it ends feeling really shallow and my chest feels even tighter, which just makes me want to take more frequent breathes and eventually completey ruin my form.
Does anyone kniw what's really happening here? How can I fix my technique?
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