Cooper Fitness Center is now open at 75% capacity in accordance with state and local guidelines. Regular hours:

  • Monday-Friday: 5 a.m.-9:30 p.m.
  • Saturday: 5:30 a.m.-8:30 p.m.
  • Sunday: 11 a.m.-7 p.m.

Click here for Cooper Fitness Center's health and safety guidelines and operational updates.

In addition to the preventive measures we have already taken and in the event of a known COVID-19 exposure, Cooper Aerobics Center follows the guidelines set by the Centers for Disease Control and Prevention (CDC) and the state of Texas.

Marni Kerner

View All Section Pages

Swim Pro


  • 15 + years of aquatic coaching experience
  • Teaching: novice through competitive swimmers; adults & children
  • Hockaday swim classroom and swim team coach, 2009-present
  • Trainer and developer of high school sports conditioning programs including swim, lacrosse, field hockey, tennis & track & field for 10+ years
  • Coaching experience also includes crew, softball, basketball, volleyball & soccer
  • Competitive mountain biker
  • Certifications: American Red Cross certified Water Safety Instructor, Lifeguard, CPR & First Aid
  • Bachelor of Arts in Philosophy, Southern Methodist University


  • Infant to Adult, Beginner to Competitive Levels
  • Triathlons
  • Open Water
  • Special Populations
  • Swimming for Fitness
  • Post-Injury Aquatics
  • Preparation for Swim Club & Summer Camp Testing


  • Private & semi-private sessions, all ages: Children/Teens | Adults
  • Summer youth swim team
  • Youth & adult swim clinics

Marni Kerner: 972.233.4832, ext. 5447 or send an email