Exhibit 5.1 [LETTERHEAD OF KIRKLAND & ELLIS] To Call Writer Directly: (212) 446-4800 June 3, 2003 Town Sports International, Inc. 888 Seventh Avenue New York, NY 10106 Re: Registration Statement on Form S-4 Ladies and Gentlemen: We are issuing this opinion letter in our capacity as special legal counsel to Town Sports International, Inc., a New York corporation (the "Issuer") and each of the guarantors listed on Exhibit A hereto (collectively, the "Guarantors" and together with the Issuer, the "Registrants"), in connection with the proposed registration by the Issuer of $255,000,000 in aggregate principal amount of the Issuer's 9 5/8% Senior Exchange Notes due 2011 (the "Exchange Notes") pursuant to a Registration Statement on Form S-4 filed with the Securities and Exchange Commission (the "Commission") under the Securities Act of 1933, as amended (the "Securities Act"). Such Registration Statement, as amended or supplemented, is hereinafter referred to as the "Registration Statement." The obligations of the Issuer under the Exchange Notes will be guaranteed by the Guarantors (the "Guarantees"). The Exchange Notes and the Guarantees are to be issued pursuant to the Indenture (as amended and supplemented from time to time, the "Indenture"), dated as of April 16, 2003 by and among the Issuer, the Guarantors and The Bank of New York, as trustee. The Exchange Notes and the Guarantees are to be issued in exchange for and in replacement of the Issuer's 9 5/8% Senior Notes due 2011 (the "Old Notes"), of which $255,000,000 in aggregate principal amount is outstanding. In that connection, we have examined originals, or copies certified or otherwise identified to our satisfaction, of such documents, corporate records and other instruments as we have deemed necessary for the purposes of this opinion, including (i) the Articles of Incorporation and Bylaws (or LLC equivalent) of the Issuer and each of the Guarantors (other than those Guarantors which are organized in Massachusetts), (ii) minutes and records of the corporate proceedings of the Issuer and the Guarantors (other than those Guarantors which are organized in Massachusetts) with respect to the issuance of the Exchange Notes and the Guarantees, (iii) the Indenture and (iv) the Registration Statement. For purposes of this opinion, we have assumed the authenticity of all documents submitted to us as originals, the conformity to the originals of all documents submitted to us as copies and the authenticity of the originals of all documents submitted to us as copies. We have also assumed the genuineness of the signatures of persons signing all documents in connection with which this opinion is rendered, the authority of such persons signing on behalf of the parties thereto other than the Registrants, and the due authorization, execution and delivery of all June 3, 2003 Page 2 documents by the parties thereto other than the Registrants. As to any facts material to the opinions expressed herein which we have not independently established or verified, we have relied upon statements and representations of officers and other representatives of the Registrants and others. Our opinion expressed below is subject to the qualifications that we express no opinion as to the applicability of, compliance with, or effect of (i) any bankruptcy, insolvency, reorganization, fraudulent transfer, fraudulent conveyance, moratorium or other similar law affecting the enforcement of creditors' rights generally, (ii) general principals of equity (regardless of whether enforcement is considered in a proceeding in equity or at law), and (iii) public policy considerations which may limit the rights of parties to obtain certain remedies. Based upon and subject to the foregoing qualifications, assumptions and limitations and the further limitations set forth below, we are of the opinion that: (i) Town Sports International, Inc. is a corporation validly existing under the laws of the State of New York and each Guarantor (other than those Guarantors which are organized in Massachusetts) is a corporation or limited liability company validly existing under the laws of its jurisdiction of incorporation set forth opposite its name on Exhibit A attached hereto. (ii) Each of the Registrants (other than those Registrants which are organized in Massachusetts) has the requisite corporate or limited liability (as applicable) power and authority to execute and deliver the Indenture and to perform its obligations thereunder. (iii) The execution and delivery of the Indenture by each of the Registrants (other than those Registrants which are organized in Massachusetts) and the performance of its obligations thereunder, has been duly authorized by each such Registrant, and does not conflict with the articles of incorporation, bylaws (or LLC equivalent) or any applicable provision of New York or Delaware law or require any consent of any New York or Delaware governmental authority. (iv) When (a) the Registration Statement becomes effective, (b) the Indenture has been duly qualified under the Trust Indenture Act of 1939, as amended, and (c) the Exchange Notes have been duly executed and authenticated in accordance with the provisions of the Indenture and duly delivered to the holders thereof in exchange for the Old Notes, the Exchange Notes and the Guarantees will be validly issued and binding obligations of the Issuer and the Guarantors, respectively. We hereby consent to the filing of this opinion as Exhibit 5.1 to the Registration Statement. We also consent to the reference to our firm under the heading "Legal Matters" in the Registration Statement. In giving this consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act of the rules and regulations of the Commission. June 3, 2003 Page 3 Our advice on every legal issue addressed in this letter is based on exclusively on the internal law of the State of New York, the General Corporation Law of the State of Delaware and the Delaware case law decided thereunder or the federal law of the United States. This opinion is limited to the specific issues addressed herein, and no opinion may be inferred or implied beyond that expressly stated herein. We assume no obligation to revise or supplement this opinion should the present laws of the State of New York or Delaware or the federal law of the United States be changed by legislative action, judicial decision or otherwise. This opinion is furnished to you in connection with the filing of the Registration Statement, and is not to be used, circulated, quoted or otherwise relied upon for any other purposes. Yours very truly, /s/ Kirkland & Ellis -------------------------- KIRKLAND & ELLIS Exhibit A Name Jurisdiction of Organization ---- ---------------------------- TSI Alexandria, LLC Delaware TSI Allston, Inc. Delaware TSI Andover, Inc. Massachusetts TSI Ardmore, LLC Delaware TSI Arthro-Fitness Services, Inc. New York TSI Battery Park, Inc. New York TSI Bethesda, LLC Delaware TSI Broadway, Inc. New York TSI 217 Broadway, Inc. New York TSI Brooklyn Belt, Inc. New York TSI Brunswick, Inc. Delaware TSI Bryn Mawr, LLC Delaware TSI Bulfinch, Inc. Delaware TSI Cash Management, Inc. New York TSI Central Square, Inc. Delaware TSI Centreville, LLC Delaware TSI Cherry Hill, LLC Delaware TSI Chevy Chase, Inc. Delaware TSI Clarendon, LLC Delaware TSI Cobble Hill, Inc. New York TSI Colonia, LLC Delaware TSI Commack, Inc. New York TSI Connecticut Avenue, Inc. Delaware TSI Copley, Inc. Delaware TSI Court Street, Inc. New York TSI Croton, Inc. New York TSI Danbury, Inc. Delaware TSI Danvers, Inc. Massachusetts TSI Downtown Crossing, Inc. Delaware TSI Dupont Circle, Inc. Delaware TSI Dupont II, Inc. Delaware TSI East Cambridge, Inc. Delaware TSI East Meadow, Inc. New York TSI East 23, Inc. New York TSI East 31, Inc. New York Name Jurisdiction of Organization ---- ---------------------------- TSI East 34, Inc. New York TSI East 36, Inc. New York TSI East 41, Inc. New York TSI East 51, Inc. New York TSI East 59, Inc. New York TSI East 76, Inc. New York TSI East 86, LLC New York TSI East 91, Inc. New York TSI F Street, Inc. Delaware TSI Fairfax, LLC Delaware TSI Fenway, Inc. Delaware TSI Fifth Avenue, Inc. New York TSI First Avenue, Inc. New York TSI Forest Hills, Inc. New York TSI Fort Lee, LLC Delaware TSI Framingham, Inc. Massachusetts TSI Franklin (MA), Inc. Massachusetts TSI Franklin Park, LLC Delaware TSI Freehold, LLC Delaware TSI Gallery Place, Inc. Delaware TSI Garden City, Inc. New York TSI Germantown, LLC Delaware TSI Glover, Inc. Delaware TSI Grand Central, Inc. New York TSI Great Neck, Inc. New York TSI Greenwich, Inc. Delaware TSI Herald, Inc. New York TSI Highpoint, LLC Delaware TSI Hoboken, LLC Delaware TSI Holdings (CIP), Inc. Delaware TSI Holdings (DC), Inc. Delaware TSI Holdings (IP), LLC Delaware TSI Holdings (MA), Inc. Massachusetts TSI Holdings (MD), Inc. Delaware TSI Holdings (NJ), Inc. Delaware TSI Holdings (PA), Inc. Delaware TSI Holdings (VA), Inc. Delaware Name Jurisdiction of Organization ---- ---------------------------- TSI Huntington, Inc. New York TSI Insurance, Inc. New York TSI International, Inc. Delaware TSI Irving Place, Inc. New York TSI Jersey City, LLC Delaware TSI Larchmont, Inc. New York TSI Lexington (MA), Inc. Massachusetts TSI Lincoln, Inc. New York TSI Long Beach, Inc. New York TSI Lynnfield, Inc. Massachusetts TSI M Street, Inc. Delaware TSI Madison, Inc. New York TSI Mahwah, LLC Delaware TSI Mamaroneck, Inc. New York TSI Market Street, LLC Delaware TSI Marlboro, LLC Delaware TSI Matawan, LLC Delaware TSI Merrifield, Inc. Delaware TSI Montclair, LLC Delaware TSI Murray Hill, Inc. New York TSI Nanuet, Inc. New York TSI Nashua, LLC Delaware TSI Natick, Inc. Delaware TSI Newark, LLC Delaware TSI Newbury Street, Inc. Delaware TSI North Bethesda, LLC Delaware TSI Norwalk, Inc. Delaware TSI Oceanside, Inc. New York TSI Old Bridge, LLC Delaware TSI Parsippany, LLC Delaware TSI Plainsboro, LLC Delaware TSI Princeton, LLC Delaware TSI Ramsey, LLC Delaware TSI Reade Street, Inc. New York TSI Ridgewood, LLC Delaware TSI Rittenhouse, LLC Delaware TSI Rodin Place, LLC Delaware Name Jurisdiction of Organization ---- ---------------------------- TSI Rye, Inc. New York TSI Scarsdale, Inc. New York TSI Seaport, Inc. New York TSI Sheridan, Inc. New York TSI Silver Spring, LLC Delaware TSI Society Hill, LLC Delaware TSI Soho, Inc. New York TSI Somerset, LLC Delaware TSI South Park Slope, Inc. New York TSI Springfield, LLC Delaware TSI Stamford Downtown, Inc. Delaware TSI Stamford Post, Inc. Delaware TSI Stamford Rinks, Inc. Delaware TSI Staten Island, Inc. New York TSI Sterling, LLC Delaware TSI Supplements, Inc. Delaware TSI Syosset, Inc. New York TSI Wall Street, Inc. New York TSI Waltham, LLC Delaware TSI Washington, Inc. Delaware TSI Water Street, Inc. New York TSI Wellesley, Inc. Massachusetts TSI West Caldwell, LLC Delaware TSI West Newton, Inc. Delaware TSI West Nyack, Inc. New York TSI West Springfield, LLC Delaware TSI West 14, Inc. New York TSI West 16, Inc. New York TSI West 23, Inc. New York TSI West 38, Inc. New York TSI West 41, Inc. New York TSI West 44, Inc. New York TSI West 48, Inc. New York TSI West 52, Inc. New York TSI West 73, Inc. New York TSI West 76, Inc. New York TSI West 80, Inc. New York Name Jurisdiction of Organization ---- ---------------------------- TSI West 94, Inc. New York TSI West 125, Inc. New York TSI Westport, Inc. Delaware TSI Westwood, LLC Delaware TSI Weymouth, Inc. Delaware TSI White Plains, Inc. New York TSI Whitestone, Inc. New York TSI Woodmere, Inc. New York