Lydia McKenzie is not a runner. Not even close. But in her quest to be taken seriously at work—and catch the eye of her office crush—she signs up for the New York City Marathon as part of her architectural firm’s outreach program. Personal trainer Luke Townsend is definitely a runner, and he’s exactly what Lydia needs to get in shape: experienced, motivational, funny, kind, well-muscled… And when he and Lydia bond over her redesign of the Manhattan Youth Center, a place near and dear to Luke’s heart, their training time intensifies from hitting the pavement to hitting the sheets. Suddenly, everything Lydia thought she wanted feels less clear, but she’s determined not to let a little unplanned indiscretion derail her goals. But when her project proposal suddenly hangs in the balance, and her office crush offers some awfully tempting one-on-one help, she’ll have to decide which direction her heart wants to run.