Rob Lowe, 57, shows off toned arms in short-sleeved shirt during beach stroll with son John, 26

Rob Lowe on His Rigorous Fitness Routine and How Wife Sheryl Saved His Life (Exclusive)

Rob Lowe reveals that Prince Harry and Meghan Markle's interview was not at his house in Montecito

Rob Lowe Finally Reveals if Prince Harry & Meghan Markle's Oprah Interview Was at His House