Going to the gym when you’ve had a bad day still burns calories. Remove the excuses and go. In fact, going to the gym when you’ve had a bad day is a great idea, and I highly recommended it. For one, it will vastly improve your mood. Even if you have a crappy workout, you’ll feel better that you went and did something. Getting those endorphins going will really help elevate you. Also, it is fantastic stress relief. If you’re angry, grab a slam ball and throw it as hard as you can against the ground repeatedly. Pretend it is your bosses/SO’s/that person that cut you off at your exit’s head. So cathartic.
I’ve even found that working out when angry makes me push even harder and I’ve gotten some of my best lifts and fastest times when I channeled all that rage into my workout. So don’t let a “bad day” be an excuse to avoid working out when it should be just the opposite! It’s an opportunity to let it all out, channel it in a healthy manner, and feel much better afterward.