Jumping rope, 15 minutes. Pick up that jump rope and get yourself going for at least 15 minutes to burn off 100 calories in no time. Jumping rope will increase your heart rate, strengthen your leg muscles and help you work up a sweat when you need a quick exercise fix.

Take the stairs, 15 minutes. Walking up flights of stairs for at least 15 minutes can help you burn off 100 calories and give your lower body a great workout. Just maintain good form and breathe deeply to make sure your muscles get plenty of oxygen during the strenuous exercise.

Gardening, 30 minutes. Head outdoors and enjoy nature with some gardening activities. Bending, lifting, digging, raking and other constant movement will easily burn off 100 calories in less than an hour, and you'll have the added benefit of reducing stress.

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Housework, 20-30 minutes. Get going on a few chores for at least 20 minutes, and you'll quickly burn off some extra calories for the day. Clean a few rooms vigorously and pay attention to the details for your mini-workout. How's the carpet looking? Vacuum for 25 minutes, and not only will you have clean floors, but you'll also burn 100 calories!