While most of us think that burning calories only happens at the gym, the truth is that your body is burning calories round the clock -- even when you're relaxing, sleeping and eating! Your metabolism is running at a specific rate throughout the day, and certain activities only increase this rate for short intervals. When you're trying to lose weight to burn off extra calories stored in your fat cells, you need to add more activities to your diet to give your metabolism a boost.

A great place to kick-start your weight loss plan is with some simple exercises and activities that burn 100 calories each; just add a few of these to your day so you can finish the day with the equivalent of an intensive workout! From walking during your lunch hour to getting up early for a quick bike ride, here are a few quick ways to burn 100 calories and get going on your weight-loss regimen: