That 62 year old woman at the pool who lapped me without trying
Two months into my couch to sprint tri plan, I was at the community pool in Spokane doing my sad 50 meter repeats, and this older lady hopped in the lane next to me. She did a full mile of perfect freestyle while I gasped through 300 total, and when I got out she just said "your kick is too stiff, relax your ankles." I fixed that one thing and my next swim felt twice as smooth, so what small correction from a stranger ended up being your biggest early win in training?