Whether you're a beginner (ROOKIE) or a veteran (ROCK STAR), the St. Peters Rec-Plex has a fun Triathlon for you! Be part of our ROOKIES & ROCK STARS TRIATHLON! The oldest pool triathlon in the region boasts a swim in a world-class natatorium, a ride through the smooth roads of St. Charles County, and a shaded run on a scenic trail. You don't stay around for this long without having something amazing. Don't miss it!!