Neil Patrick Harris has been stepping up his gym routine this summer. The How I Met Your Mother star, 53, displayed his legendary body as he spent a day at sea with his husband David Burtka, 51, and their children on board Elton John's yacht. Along with their children, the couple enjoyed a day of sunshine and swimming as they explored the South of France coast by sea. Clearly Harris has been preparing for this moment at the gym. A sculpted and shirtless Harris rinsed himself off in the ship's outdoor shower, basking in the cool water and sea air. Once dry, Harris explored the boat in little more than swimming trunks, sunglasses, and a…
