If you're shaping up for a warm-weather vacation, don't undo all your hard work once you get there with an overindulgent week. The next time you take a break, use these tips from Barry's Bootcamp instructor Courtney Paul, who knows a thing or two about staying fit on vacation — he's hosting a fitness retreat at the West Bay Club in Turks and Caicos in May. Even if you're not willing to commit to a full-on fitness routine during your holidays, here's how Courtney says you can enjoy your vacation while beating weight gain and feeling your best, no matter how much resting and relaxing you do.