Movement is so important to our health and wellness. Focus on how exercise makes you feel when you are moving and when you finish (not how tired you may think you are). You should feel a great sense of accomplishment. Keep moving! Regular exercise is one of the best things you can do for yourself everyday. It's a mood changer, a great way to make yourself more productive throughout the day.
Click on a video, and follow along. Don't stop moving the whole time.