DOMS happens with even the most fit people, so it's not just for those who don't exercise regularly. Anytime you change your routine and challenge your muscles in different ways, DOMS can occur.
"You may have a fresh start any moment you choose, for this thing that we call "failure" is not the falling down but the staying down." Mary Pickford
"No matter how slow you go, you are still lapping everybody on the couch."