Retired PGA golf professional-turned-pro caddie Jim Tennant does dead lifts at Gold’s Gym outside Augusta, Ga. He says at 51, staying fit is key to keeping up on the course. MELISSA GOLDEN FOR THE WALL STREET JOURNAL

Jim Tennant started caddying at age 12 and carried clubs through his teens as a way to save some fun money. Now retired, he’s hauling 40-pound golf bags around the green again.

Mr. Tennant, 51, retired in 2016 after working 25 years as a PGA golf professional teaching juniors and women. Looking to stay connected to the game, he began caddying that fall at private clubs in Augusta, Ga., and near his Massachusetts summer home on Cape Cod.