Kylie Jenner is always going to keep it tight ... even while on a yacht in the Mediterranean, where she got in a workout while wearing a sports bra. Check out the video from Kylie's onboard exercise ... she's in a black top and spandex shorts, maintaining her fitness routine on a reformer Pilates machine ... working her arms and her legs. Kylie is on a mega yacht anchored off the coast of Sardinia ... she's with some friends and it looks like she's unwinding after a wild few weeks with