Travelling means time spent waiting in airport transit lounges, trains or bus stations, all places have dozens of cafes and candy stores. Boredom and restlessness can drive you to buy candy bars, chips, chocolate and other high calorie foods that you simply we don't need. To avoid the junk food trap, pack your own healthy snacks like unsalted almonds, a few pieces of fruit or a low-calorie health bar. If traveling by plane, be sure to drink plenty of water to avoid dehydration. Most airlines also have options for low calorie, low sodium and low fat in-flight meals. You can preorder one of these by checking-in online at least 48 hours before your flight depart and selecting these special meal choices.
Most hotels have swimming pools and you should certainly take full advantage of these for some cardio and to tone up your muscles. For an extra boost of fitness, supplement your in-room workouts with ten to fifteen laps in the pool. Before you leave for your destination, do some research and find out if there are any scenic walking or jogging paths close to where you stay. If there are, make it a point to use these in the morning. That way you can get your blood pumping and take in some fresh air while getting to know the city. If you enjoy cycling or hiking, find out where you can go to do these activities and plan a daytrip outdoors. Being out in nature, rather than in shopping malls and piazzas removes the temptation to sample exotic local treats every hour or so.