Exhibit 21.1 Subsidiaries Town Sports AG TSI Alexandria, LLC TSI Allston, Inc. TSI Andover, Inc. TSI Ardmore, LLC TSI Arthro-Fitness Services, Inc. TSI Astoria, Inc. TSI Battery Park, Inc. TSI Bethesda, LLC TSI Broadway, Inc. TSI 217 Broadway, Inc. TSI Brooklyn Belt, Inc. TSI Brunswick, Inc. TSI Bryn Mawr, LLC TSI Bulfinch, Inc. TSI Cash Management, Inc. TSI Central Square, Inc. TSI Centreville, LLC TSI Cherry Hill, LLC TSI Chevy Chase, Inc. TSI Clarendon, LLC TSI Cobble Hill, Inc. TSI Colonia, LLC TSI Commack, Inc. TSI Connecticut Avenue, Inc. TSI Copley, Inc. TSI Court Street, Inc. TSI Croton, Inc. TSI Danbury, Inc. TSI Danvers, Inc. TSI Downtown Crossing, Inc. TSI Dupont Circle, Inc. TSI Dupont II, Inc. TSI East Cambridge, Inc. TSI East Meadow, Inc. TSI East 23, Inc. TSI East 31, Inc. TSI East 34, Inc. TSI East 36, Inc. TSI East 41, Inc. TSI East 51, Inc. TSI East 59, Inc. TSI East 76, Inc. TSI East 86, LLC TSI East 91, Inc. TSI F Street, Inc. TSI Fairfax, LLC TSI Fenway, Inc. TSI Fifth Avenue, Inc. TSI First Avenue, Inc. TSI Forest Hills, Inc. TSI Fort Lee, LLC TSI Framingham, Inc. TSI Franklin (MA), Inc. TSI Franklin Park, LLC TSI Freehold, LLC TSI Gallery Place, Inc. TSI Garden City, Inc. TSI Germantown, LLC TSI Glover, Inc. TSI Grand Central, Inc. TSI Great Neck, Inc. TSI Greenwich, Inc. TSI Herald, Inc. TSI Highpoint, LLC TSI Hoboken, LLC TSI Holdings (CIP), Inc. TSI Holdings (DC), Inc. TSI Holdings (IP), LLC TSI Holdings (MA), Inc. TSI Holdings (MD), Inc. TSI Holdings (NJ), Inc. TSI Holdings (PA), Inc. TSI Holdings (VA), Inc. TSI Huntington, Inc. TSI Insurance, Inc. 2 TSI International, Inc. TSI Irving Place, Inc. TSI Jersey City, LLC TSI Larchmont, Inc. TSI Lexington (MA), Inc. TSI Lincoln, Inc. TSI Long Beach, Inc. TSI Lynnfield, Inc. TSI M Street, Inc. TSI Madison, Inc. TSI Mahwah, LLC TSI Mamaroneck, Inc. TSI Market Street, LLC TSI Marlboro, LLC TSI Matawan, LLC TSI Merrifield, Inc. TSI Montclair, LLC TSI Murray Hill, Inc. TSI Nanuet, Inc. TSI Nashua, LLC TSI Natick, Inc. TSI Newark, LLC TSI Newbury Street, Inc. TSI North Bethesda, LLC TSI Norwalk, Inc. TSI Oceanside, Inc. TSI Old Bridge, LLC TSI Parsippany, LLC TSI Plainsboro, LLC TSI Princeton, LLC TSI Ramsey, LLC TSI Reade Street, Inc. TSI Ridgewood, LLC TSI Rittenhouse, LLC TSI Rodin Place, LLC TSI Rye, Inc. TSI Scarsdale, Inc. TSI Seaport, Inc. 3 TSI Sheridan, Inc. TSI Silver Spring, LLC TSI Society Hill, LLC TSI Soho, Inc. TSI Somerset, LLC TSI South Park Slope, Inc. TSI Springfield, LLC TSI Stamford Downtown, Inc. TSI Stamford Post, Inc. TSI Stamford Rinks, Inc. TSI Staten Island, Inc. TSI Sterling, LLC TSI Supplements, Inc. TSI Syosset, Inc. TSI Wall Street, Inc. TSI Waltham, LLC TSI Washington, Inc. TSI Water Street, Inc. TSI Wellesley, Inc. TSI West Caldwell, LLC TSI West Newton, Inc. TSI West Nyack, Inc. TSI West Springfield, LLC TSI West 14, Inc. TSI West 16, Inc. TSI West 23, Inc. TSI West 38, Inc. TSI West 41, Inc. TSI West 44, Inc. TSI West 48, Inc. TSI West 52, Inc. TSI West 73, Inc. TSI West 76, Inc. TSI West 80, Inc. TSI West 94, Inc. TSI West 125, Inc. TSI Westport, Inc. TSI Westwood, LLC 4 TSI Weymouth, Inc. TSI White Plains, Inc. TSI Whitestone, Inc. TSI Woodmere, Inc. 5