Sweet Mother of Pearl! Those are some nicely defined abs!
(Also, I think I'm 12 because I can't help but snicker at all the innuendo-y things I can do with this title.)
Pump Me Up (Work Out #2) by Andrew Grey
Taking advantage of a free pass from work, Maddoc decides to try out a fitness center. After meeting up with a friend, Dan, and making dinner plans, Maddoc meets Ivan, a hunky, silver-haired ex-Marine who gives him a ride home. Soon Maddoc finds himself with a new friend, a workout partner, a protector... and maybe something more, as a simmering attraction comes to life between him and Ivan. After moving too fast in previous relationships that fell apart, Maddoc wants to start slow—wants to make sure it can last. Luckily, Ivan is willing to wait.