The LA Fitness location south of Crystal City is gearing up for a major makeover. Located on 3550 S. Clark Street in the National Gateway complex near Potomac Yard, the gym announced via flyers last week that it will shut its doors on Friday, Dec. 1, at 2 p.m. and reemerge as "Club Studio Fitness." The The LA Fitness at National Gateway shopping center is gearing up for a major makeover. Located on 3550 S. Clark Street, just South of Crystal City, the gym announced via flyers last week that it will shut its doors on Friday, Dec. 1, at 2 p.m. and reemerge as Club Studio Fitness.