When gyms closed at the start of the pandemic, Kevin Allen’s at-home fitness app, Row Vigor, went gangbusters. But there was a problem -- a few lines of code were preventing Kevin from cashing in.

Co-founders Kevin Allen and Moses McCall think rowing is the next big trend in fitness. To cash in on their hunch, they need to convince investors they can make waves in a space already crowded with competitors. Today's inves...