Other forms: joggers
That person in workout gear running past at an easy pace is a jogger. If you like to go for regular gentle runs, you can call yourself a jogger too.
Unlike serious runners, joggers are usually more casual about their exercise routine. Most joggers aren't training to run a marathon, they're just out moving their bodies and enjoying the fresh air. While the difference may seem subtle, you can generally describe anyone running at a fairly slow pace as a jogger. Before about 1968, when jogging first became popular, jogger was used to mean "anyone who walks heavily and slowly."