OCT. 21

Lunchtime Exercise Classes: Walking and exercises using park benches to work different muscle groups. 1-1:45 p.m., FREE. Morningside Park, 112th Street and Manhattan Avenue. Info: 419-962-6292

New York Memory Center -- Bushwick Open House: Learn about services for those living with Alzheimer's and other forms of dementia. 10 a.m.-3 p.m. 1143-45 Dekalb Ave., Bushwick. Info: 718-781-7697

Shape Up NYC -- Bolly X: Bollywood-inspired dance fitness program. 7:10-8 p.m., FREE. Hudson Guild Elliott Center, 441 W. 26th St. Info: 212-760-9800

Shape Up NYC -- Capoeira: Brazilian art form combining dance, martial arts and acrobatics. 8:15-9:45 p.m., FREE. Hudson Guild Elliott Center, 441 W. 26th St. Info: 212-760-9800

OCT. 22

Morning Fitness at Fort Tryon Park: Walking, stretching and strengthening exercises. 7:30-8:30 a.m., FREE. Heather Garden, Cabrini Boulevard and Fort Washington Avenue. Info: 212-795-1388

New York State Health Open Enrollment Workshop: Learn about Medicare, the Affordable Care Act and the state's healthcare exchange. Hosted by NYC Health and Hospitals and Centers for Medicare & Medicaid Services. 8 a.m.-1 p.m., FREE. Gouverneur Health, 227 Madison St., main floor auditorium. RSVP here

Yoga at Morris-Jumel Mansion: Vinyasa Flow-style, moderate class. 1-2 p.m., FREE ($5 suggested donation). 65 Jumel Terrace. Info: 212-923-8008

Open Run Night at Icahn Stadium: For beginners and avid runners alike. 6-8 p.m., FREE. Randall's Island Park. Info: 212-830-7722

CheerFit Pep Rally: Cheer-inspired workout party. 7-8 p.m., FREE. Athleta, 121 Wooster St. RSVP here

OCT. 23

Outdoor Exercise Classes: Walking and exercises using park benches to work different muscle groups. 7-7:45 a.m., FREE. Morningside Park, 112th Street and Manhattan Avenue. Info: 419-962-6292

OCT. 24

Run the River 5K: Run in support of Randall's Island Park preservation. 8:30 a.m., $40 in advance, $45 day of. Icahn Stadium at Randall's Island Park. Register here

Morning Fitness at Fort Tryon Park: Walking, stretching and strengthening exercises. 8:30-9:30 a.m., FREE. Heather Garden, Cabrini Boulevard and Fort Washington Avenue. Info: 212-795-1388

Pile for Pink: Special Xtend Barre Brooklyn donation class in support of National Breast Cancer Awareness Month. Proceeds go to 5 Under Forty. 2 p.m., $30. 147 Remsen St., Brooklyn Heights. Register here 

Big Apple Crunch: Celebration of healthy, seasonal eating as part of National Food Day.

OCT. 25

Kerboomka Dance Fitness: With instructor Nikki Pebbles. 9:30-10:30 a.m., FREE. Athleta, 125 Fifth Ave. Info and RSVP: 212-929-0512

Yoga at Morris-Jumel Mansion: Vinyasa Flow-style, moderate class. 1-2 p.m., FREE ($5 suggested donation). 65 Jumel Terrace. Info: 212-923-8008

Yoga for Runners: Pre-marathon yoga class designed for runners. 1:30-2:30 p.m., FREE. Central Park's Great Hill, West 106th Street. Register here

OCT. 26

Outdoor Exercise Classes: Walking and exercises using park benches to work different muscle groups. 7-7:45 a.m., FREE. Morningside Park, 112th Street and Manhattan Avenue. Info: 419-962-6292

Shape Up NYC -- Ninja Balance/Supple Strength: HIIT class. 6:30-7:30 p.m., FREE. Hudson Guild Elliott Center, 441 W. 26th St. Info: 212-924-6710

OCT. 27

Morning Fitness at Fort Tryon Park: Strengthening exercises. 7:30-8:30 a.m., FREE. Heather Garden, Cabrini Boulevard and Fort Washington Avenue. Info: 212-795-1388

Tai Chi Class: For all levels and abilities. 9-10 a.m., FREE. Garibaldi Plaza in Washington Square Park. Info: Sarah.neilson@parks.nyc.gov