Swimming is often the weakest event faced by triathletes, which is why the Rockville Swim and Fitness Center offers two swimming programs geared specifically to the open-water component of a triathlon.

The center’s certified coaches understand the challenges of open-water swimming and the need to swim efficiently. Beginners to world-class triathletes can take part. Register with the course numbers listed below at www.rockvillemd.gov/registration.

Triathlon Swim Skills: Designed so athletes develop a more efficient freestyle stroke and prepare for open-water swimming. 8:05-8:55 a.m. Sundays, from Oct. 28-Dec. 16; course #6259. The cost is $64 for members, $72 for nonmembers.

Triathlete Swim Endurance: For athletes preparing for Olympic to Ironman distance races or open-water swims. 7-8:30 p.m. Sundays, from Oct. 28-Dec. 16; course #6561. The cost is $95 for members, $107 for nonmembers.

Find out about Rockville Swim and Fitness Center pool schedules, seasonal hours, personal training opportunities and more at www.rockvillemd.gov/swimcenter.