The Trouble with Love and Coaches by Harriet Ashford

April Baird is determined to finish an Ironman—even if it is 140.6 miles of misery in the form of swimming, cycling, and running. The distance would be daunting enough, but April is certain she has an Ironman curse. What else could explain the events that have caused her to DNF the last three years? Now, her coach has even bailed.
When Gabriel Torres discovers his rival, April’s former coach, has dropped her mid-season, he has a choice to make: stick with the plan and a team that’s sure to win or add April to his roster. She’s a risk—one that may cost him his chance at making the dream team of his coaching company, and yet, he sees a spark in her—something he’d pay good money to bottle and add to his other athletes’ electrolytes.

As training heats up, their relationship slips from professional to casual to something else entirely, and they soon realize there is more at stake than just a race.