Tim McGraw [1] broke a sweat during a serious workout in San Diego, CA, on Wednesday. The country star and a group of pals did push-ups and running drills, even showing off their handstand skills against a wall. Tim's impressive shirtless [2] body was on display during the session, as was his sweet "Faith" arm tattoo, honoring his wife, Faith Hill [3]. The outdoor workout came just before Tim took the stage for a private concert for restaurant chain, Zaxby's, at the Hotel del Coronado. The party's guests weren't the only ones who enjoyed the show — since the setup was on the sand, plenty of beachgoers got to watch Tim sing [4] his stuff too. Tim may have kept the fun going until the end of the week, since Friday marked his 49th birthday!