Cooper Fitness Center is now open at 25% capacity in accordance with state and local guidelines. Limited hours:

  • Monday-Saturday, 6 a.m.-8 p.m.
  • Sunday, 11 a.m.-7 p.m.

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

Marni Kerner

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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