Meet up with other runners Thursday for a 1.75 mile or 3.1 mile trek around Greenbelt Lake that is timed, according to the Prince George's County Running Club.

It starts promptly at 7 p.m., but if you haven't registered yet, do that first. Registration starts before the run, from 6:15 p.m. to 6:45 p.m. Runners meet at the Greenbelt Youth Center parking lot, where registration takes place.

The number of runners have increased since 2009, when the summer fun runs began. Some Thursdays, up to 40 people have taken part, according to Andrew Phelan, sports and recreation coordinator with the Greenbelt Recreation Department.

Summer fun runs will continue on Thursdays through July and August.

For more information, see the Prince George's Running Club's website.