About Core Fitness Conveniently Located Professionally Managed Facilities Check Us Out Conveniently Located Core Fitnes s offers personal 3D fitness training and cla sses, nutrition counseling, and massage therapy. We are conveniently located in 42 State Street, North Haven, Connecticut — minutes away from both the Merritt Parkway Route 15 or Route 91. Our building and sign (pictured here) can easily be seen from the road.