The sixth book in the New York Times bestselling series that began with Nat Enough!

You don't know until you try...

Nat doesn't think she's an athlete, but after a series of painfully embarrassing moments, she's determined to build her confidence and signs up for a triathlon with her best friend, Zoe. As training begins, Nat realizes she's in way over her head, facing so many setbacks and challenges that she wonders why she ever signed up! Can Nat get out of her own way and complete the triathlon, or will she convince herself that she's not cut out for it and quit?