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                                                                    EXHIBIT 3.51




               [DELAWARE STATE OFFICE OF SECRETARY OF STATE SEAL]


                            -----------------------

I, MICHAEL HARKINS, SECRETARY OF STATE OF THE STATE OF DELAWARE DO HEREBY
CERTIFY THE ATTACHED IS A TRUE AND CORRECT COPY OF THE CERTIFICATE OF
INCORPORATION OF HEALTH & TENNIS CORPORATION OF NEW YORK FILED IN THIS OFFICE
ON THE TWENTY-SEVENTH DAY OF JANUARY, A.D. AT 10 O'CLOCK A.M.




[DELAWARE SECRETARY OF STATE SEAL]         /s/ Michael Harkins
                                           -----------------------------------
                                           Michael Harkins, Secretary of State

                                           AUTHENTICATION:  2044731

                                                     DATE:   01/27/1989

                          CERTIFICATE OF INCORPORATION

                                       OF

                    HEALTH & TENNIS CORPORATION OF NEW YORK

         FIRST: The name of the Corporation is Health & Tennis Corporation of
New York.

         SECOND: The address of its registered office in the State of Delaware
is No. 1209 Orange Street, in the City of Wilmington, County of New Castle. The
name of its registered agent at such address is The Corporation Trust Company.

         THIRD: The nature of the business or purposes to be conducted or
promoted is:

                  To engage in any lawful act or activity for which
         corporations may be organized under the General Corporation Law of
         Delaware.

         FOURTH: The total number of shares of stock which the Corporation shall
have authority to issue is Three Thousand (3,000) and the par value of each of
such shares is One Cent ($.01).

         FIFTH: The name and mailing address of the Incorporator is as follows:

          NAME                         MAILING ADDRESS
          ----                         ---------------

    ACFB Incorporated                 850 Euclid Avenue
                                      1100 Citizens Building
                                      Cleveland, Ohio 44114

         SIXTH: The Corporation is to have perpetual existence.

         SEVENTH: In furtherance and not in limitation of the powers conferred
by statute, the board of directors is expressly authorized:

                  To make, alter or repeal the by-laws of the Corporation.

                  To authorize and cause to be executed mortgages and liens upon
         the real property of the Corporation.

                  To set apart out of any of the funds of the Corporation
         available for dividends a reserve or reserves for any proper purpose
         and to abolish any such reserve in the  manner in which it was created.

                  By a majority of the whole board, to designate one or more
         committees, each committee to consist of one or more of the directors
         of the Corporation. The board may designate one or more directors as

         alternate members of any committee, who may replace any absent or
         disqualified member at any meeting of the committee. The by-laws may
         provide that in the absence or disqualification of a member of a
         committee, the member or members thereof present at any meeting and not
         disqualified from voting, whether or not he or they constitute a
         quorum, may unanimously appoint another member of the board of
         directors to act at the meeting in the place of any such absent or
         disqualified member. Any such committee, to the extent provided in the
         resolution of the board of directors, or in the by-laws of the
         Corporation, shall have and may exercise all of the powers and
         authority of the board of directors in the management of the business
         and affairs of the Corporation, and may authorize the seal of the
         Corporation to be affixed to all papers which may require it; but no
         such committee shall have the power or authority in reference to
         amending the certificate of incorporation, adopting an agreement of
         merger or consolidation, recommending to the stockholders the sale,
         lease or exchange of all or substantially all of the Corporation's
         property and assets, recommending to the stockholders a dissolution of
         the Corporation or a revocation of a dissolution, or amending the
         by-laws of the Corporation; and unless the resolution or by-laws
         expressly so provide, no such committee shall have the power or
         authority to declare a dividend or to authorize the issuance of stock.

                  When and as authorized by the stockholders in accordance with
         statute, to sell, lease or exchange all or substantially all of the
         property and assets of the Corporation, including its good will and its
         corporate franchises, upon such terms and conditions and for such
         consideration, which may consist, in whole or in part, of money or
         property, including shares of stock in, and/or other securities of, any
         other corporation or corporations, as its board of directors shall deem
         expedient and for the best interests of the Corporation.

         EIGHT: Whenever a compromise or arrangement is proposed between this
Corporation and its creditors or any class of them and/or between this
Corporation and its stockholders or any class of them, any court of equitable
jurisdiction within the State of Delaware may, on the application in a summary
way of this Corporation or of any creditor or stockholder thereof or on the
application of any receiver or receivers appointed for this Corporation under
the provisions of Section 291 of Title 8 of the Delaware Code or on the
application of trustees in dissolution or of any receiver or receivers appointed
for this Corporation under the provisions of Section 279 of Title 8 of the
Delaware Code order a meeting of the creditors or class of creditors, and/or of
the stockholders of class of stockholders of this Corporation, as the case may
be, to be summoned in such manner as the said court directs. If a majority in
number representing three-fourths in value of the creditors or class of
creditors, and/or of the stockholders or class of stockholders of this
Corporation, as the case may be, agree to any compromise or arrangement and to
any reorganization of this Corporation as consequence of such compromise or
arrangement, the said compromise or arrangement and the said reorganization
shall, if sanctioned by the court to which the said application has been made,
be binding on all the creditors or class of creditors and/or on all the
stockholders or class of stockholders, of this Corporation, as the case may be
and also on this Corporation.


                                      -2-

         NINTH: Meetings of stockholders may be held within or without the State
of Delaware, as the by-laws may provide. The books of the Corporation may be
kept (subject to any provision contained in the statutes) outside the State of
Delaware at such place or places as may be designated from time to time by the
board of directors or in the by-laws of the Corporation. Elections of directors
need not be by written ballot unless the by-laws of the Corporation shall so
provide.

         TENTH: The Corporation reserves the right to amend, alter, change or
repeal any provision contained in this Certificate of Incorporation, in the
manner now or hereafter prescribed by statute, and all rights conferred upon
stockholders herein are granted subject to this reservation.

         ELEVENTH: No Director shall be personally liable to the Corporation or
any of its stockholders for monetary damages for breach of fiduciary duty as a
Director, except for liability (1) for any breach of the Director's duty of
loyalty to the Corporation or its stockholders, (2) for acts or omissions not in
good faith or which involve intentional misconduct or a knowing violation of
law, (3) under Section 174 of the Delaware General Corporation Law, or (4) for
any transaction from which the Director derived an improper personal benefit. If
the Delaware General Corporation Law hereafter is amended to authorize the
further elimination or limitation of the liability of Directors, then the
liability of a Director of the Corporation, in addition to the limitations on
personal liability provided herein, shall be limited to the fullest extent
permitted by the amended Delaware General Corporation Law. Any repeal or
modification of this Article shall be prospective only, and shall not adversely
affect any limitation on the personal liability of a Director of the Corporation
existing at the time of such repeal or modification.

         TWELFTH: A. Each person who was or is made a party to or is threatened
to be made a party to or is involved in any action, suit or proceeding, whether
civil, criminal, administrative or investigative (hereinafter a "proceed"), by
reason of the fact that he or she, or a person or whom he or she is the legal
representative, is or was a Director or officer of the Corporation or is or was
serving at the request of the Corporation as a Director, officer, employee or
agent of another corporation or of a partnership, joint venture, trust or other
enterprise, including service with respect to employee benefit plans, whether
the basis of such proceeding is alleged action in an official capacity as a
Director, officer, employee or agent or in any other capacity while serving as a
Director, officer, employee or agent, shall be indemnified and held harmless by
the Corporation to the fullest extent authorized by the Delaware General
Corporation Law, as the same exists or may hereafter be amended (but, in the
case of any such amendment, only to the extent that such amendment permits the
Corporation to provide broader indemnification rights than said law permitted
the Corporation to provide prior to such amendment), against all expense,
liability and loss (including attorneys' fees, judgements, fines, ERISA excise
taxes or penalties and amounts paid or to be paid in settlement) reasonably
incurred or suffered by such person in connection therewith and such
indemnification shall continue as to a person who has ceased to be a Director,
officer, employee or agent and shall inure to the benefit of his or her heirs,
executors and administrators; provided, however, that, except as provided in
subsection B of this Article, the Corporation shall indemnify any such person


                                      -3-

seeking indemnification in connection with a proceeding (or part thereof)
initiated by such person only if such proceeding (or part thereof) was
authorized by the Board of Directors of the Corporation. The right to
indemnification conferred in this Article shall be a contract right and shall
include the right to be paid by the Corporation the expenses incurred in
defending any such proceeding in advance of its final disposition; provided,
however, that if the Delaware General Corporation Law requires, the payment of
such expenses incurred by a Director or officer in his or her capacity as a
Director or officer (and not in any other capacity in which service was or is
rendered by such person while a Director or officer, including, without
limitation, service to an employee benefit plan) in advance of the final
disposition of a proceeding shall be made only upon delivery to the Corporation
of an undertaking, by or on behalf of such Director or officer, to repay all
amounts so advanced if it shall ultimately be determined that such Director or
officer is not entitled to be indemnified under this Article or otherwise. The
Corporation may, by action of its Board of Directors, provide indemnification to
employees and agents of the Corporation with the same scope and effect as the
foregoing indemnification of Directors and officers.

         B. If a claim under subsection A of this Article is not paid in full by
the Corporation within thirty (30) days after a written claim has been received
by the Corporation, the claimant may at any time thereafter bring suit against
the Corporation to recover the unpaid amount of the claim and, if successful in
whole or in part, the claimant shall be entitled to be paid also the expense of
prosecuting such claim. It shall be a defense to any such action (other  than an
action brought to enforce a claim for expenses incurred in defending any
proceeding in advance of its final disposition where the required undertaking,
if any is required, has been tendered to the Corporation) that the claimant has
not met the standards of conduct which make it permissible under the Delaware
General Corporation Law for the Corporation to indemnify the claimant for the
amount claimed, but the burden of proving such defense shall be on the
Corporation. Neither the failure of the Corporation (including its Board or
Directors, independent legal counsel, or its stockholders) to have made a
determination prior to the commencement of such action that indemnification of
the claimant is proper in the circumstances because he or she has met the
applicable standard of conduct set forth in the Delaware General Corporation
Law, nor an actual determination by the Corporation (including the Board of
Directors, independent legal counsel, or its stockholders) that the claimant has
not met such applicable standard of conduct, shall be a defense to the action or
create a presumption that the claimant has not met the applicable standard of
conduct.

         C. The right to indemnification and the payment of expenses incurred in
defending a proceeding in advance of its final disposition conferred in this
Article shall not be exclusive of any other right which any person may have or
hereafter acquire under any statute, provision of this Certificate of
Incorporation, by-law, agreement, vote of stockholders or disinterested
Directors or otherwise.

         D. The Corporation may maintain insurance, at its expense, to protect
itself and any Director, officer, employee or agent of the Corporation or
another corporation, partnership, joint venture, trust or other enterprise
against any such expense, liability or loss, whether or not the Corporation


                                      -4-

would have the power to indemnify such person against such expense, liability or
loss under the Delaware General Corporation Law.

         E. As used in this Article, references to "the Corporation" shall
include, in addition to the resulting or surviving corporation, any constituent
corporation absorbed in a consolidation or merger which, if its separate
existence had continued, would have had power and authority to indemnify its
Directors, officers, employees and agents, so that any person who is or was a
Director, officer, employee or agent of such constituent corporation, or is or
was serving at the request of such constituent corporation as a Director,
officer, employee or agent of another corporation, partnership, joint venture,
trust, or other enterprise, shall stand in the same position under the
provisions of this Article with respect to the resulting or surviving
corporation as he would have with respect to such constituent corporation if its
separate existence had continued.

         F. If this Article or any portion hereof shall be invalidated on any
ground by any court of competent jurisdiction, then the Corporation shall
nevertheless indemnify each Director, officer, employee and agent of the
Corporation as to expenses (including attorneys' fees), judgements, fines and
amounts paid in settlement with respect to any action, suit or proceeding,
whether civil, criminal, administrative or investigative, including a grand jury
proceeding and an action by the Corporation, to the fullest extent permitted by
any applicable portion of this Article that shall not have been invalidated or
by any other applicable law.

         THE UNDERSIGNED, being the Incorporator hereinabove named, for the
purpose of forming a corporation pursuant to the General Corporation Law of the
State of Delaware, do make this certificate, hereby declaring and certifying
that this is its act and deed and the facts herein stated are true, and
accordingly have hereunto set its hand this 26th day of January, 1989.


                                    ACFB INCORPORATED
ATTEST:                             Incorporator

By: /s/ Irving Berliner             By: /s/ Lawrence M. Bell
   ----------------------------         ------------------------------------
   Irving Berliner, Assistant           Lawrence M. Bell, President
     Secretary