Gretchen Walsh, ‘bathtub swimmer’ no more, arrives at her big Olympic moment

Bathtub swimmer.

Gretchen Walsh sometimes uses the term her critics once used to poke at her, but it’s OK now. She’s shed the label once and for all, and perhaps even more importantly, she’s convinced herself she’s more than just a short-course swimmer.

She’s an Olympian. She’s a world…