When we get angry, we get so caught up in anger that we forget to take the time to allow the opposite. This is a wider approach to anger. Of course, if you're having a conversation at work and something makes you angry, you can't all of a sudden shut your eyes and go to your happy place, but you can manage your anger by taking the time outside of work to relax and do things you enjoy that quite literally help you relax.
While we're on the subject, meditation often gets a stigma as being a bit too new age-y for a lot of people. However, it doesn't have to have that attached to it. It will definitely help and can't hurt to try, right?