Produced by the Myrtle Beach Triathlon Club, this trail run offers several challenging options. The course will take place at HULK—the Horry County Bike and Run Park—whose nickname comes from Universal Studio’s Hulk rollercoaster, which is constantly twisting and turning. Featuring 10K, 20K and 50K options, this trail run will take you through elevation changes, waterway views, grassy meadows and more. Horry County Bike & Run Park, Frontage Road B-2. Saturday, 7 a.m. $35–$55. www.mbtriclub.org