Also on the way to Wildwood Shopping Center this winter is Solidcore, the D.C. fitness chain known for its high-intensity workouts on Pilates-based Megaformer machines. Founded two years ago in Adams Morgan, Solidcore promises a personalized, boutique atmosphere with 50-minute classes that are designed to exhaust every muscle. The Wildwood location, set to open after Thanksgiving, will have 14 machines that must be reserved and paid for online before you arrive. At peak times, those slots can fill up quickly. “Our typical clients are hard-working, hard-driving individuals who like to be challenged,” says Solidcore vice president Erika Elko. “Many are athletes and former athletes who have been very successful in their lives and careers.” At Solidcore’s price point, they’d have to be successful: The gym charges upwards of $35 for a single class, with one-year unlimited memberships going for nearly $3,500.