Along with the workout video, pack some healthful snacks—almonds, dried fruit, or a high-fiber, low-calorie energy bar, such as a Luna bar—into your carry-on. That way, you won’t be at the mercy of rest-stop or airline food. If you must buy food, be prepared to spend a little extra. Airport vendors often charge more for a bowl of fruit than for a cinnamon bun, but paying that extra $2 now is far less than the price you’ll eventually pay if you routinely shortchange your health. At restaurants, stick to lean protein and ask your waiter to double the vegetables and hold the rice or potatoes. With a little practice, your next trip won’t be an excuse to take a vacation from a healthy lifestyle.