Sullivan Papain Block McGrath & Cannavo, P.C., New York, N.Y. (Stephen C. Glasser and Susan M. Jaffe of counsel), for appellant.

Andrea G. Sawyers, Melville, N.Y. (Scott W. Driver of counsel), for respondents.

In an action to recover damages for personal injuries, the plaintiff appeals from an order of the Supreme Court, Suffolk County (Pastoressa, J.), dated March 18, 2013, which granted the defendants' motion for summary judgment dismissing the complaint and denied her cross motion to compel an additional nonparty witness to appear for a deposition.

Ordered that the order is affirmed, with costs.

The plaintiff was participating in a step aerobics class at the defendants' fitness center when she allegedly lost her footing and fell, causing her to sustain injuries. "[B]y engaging in a sport or recreational activity, a participant consents to those commonly appreciated risks which are inherent in and arise out of the nature of the sport generally and flow from such participation" (Morgan v State of New York, 90 NY2d 471, 484 [1997]). In support of their motion, the defendants established their prima facie entitlement to judgment as a matter of law by demonstrating that the plaintiff assumed the risk of injury by voluntarily participating in the subject class (see Ramirez v Lucille Roberts Health Clubs, Inc., 110 AD3d 975 [2013]; Berry v Bally Total Fitness Corp., 272 AD2d 354, 355 [2000]).

In opposition, the plaintiff failed to raise a triable issue of fact. The affidavit of the plaintiff's expert consisted only of a speculative and conclusory opinion that the defendants had unreasonably increased the risks to the plaintiff by failing to instruct and supervise her properly in the activity and in placing too many risers underneath the plaintiff's step platform. Thus, it was insufficient to satisfy the plaintiff's burden in opposition to the defendants' motion (see DiGiose v Bellmore-Merrick Cent. High School Dist., 50 AD3d 623, 624 [2008]).

The plaintiff's remaining contentions are without merit.

Therefore, the Supreme Court properly granted the defendants' motion and denied the plaintiff's cross motion. Eng, P.J., Rivera, Roman and LaSalle, JJ., concur.