Unlike many full-time indie hackers, I did not wait until my side-project was profitable before taking the plunge. The way I looked at it— there is already so much peripheral market validation in the digital fitness industry; either I continue juggling a bit of marketing and coding weeknights and weekends until I make some money, or I just trust my gut and give SuperFit my all.
On top of that, I'm helping a close friend with a gym he started. It's the the perfect opportunity and testing grounds for my app to grow :).