As a student, I sometimes come home so exhausted and just want to plop down, eat, and go to bed. I definitely don't have time or money for a gym membership. The guide (above) is a really easy way to exercise, burn about 100 calories, and I don't need any equipment or weights. The only problem I run into at times is lack of space in my apartment, so I am sometimes bumping into things. Here's more information on the correct techniques for jumping jacks, sit-ups, shoulder lateral raises, push-ups, and squats.