Distance: 3.2 miles

Obstacles: 15–20

Difficulty: The obstacles are designed by firefighters to mimic some of the trials encountered in a blaze. The pole and water slides are easy, but there are also plenty of challenges: dragging tires over platforms, negotiating a rope bridge, and the Towering Inferno – a vertical climb up a flight of slippery stairs in the rain.

The Vibe: This is a family-oriented event – each one has two races for kids. Firefighters make up a third of the participants, and some of the proceeds go to the foundations of local fire-related charities.

Cost: $60–$75; herorush.com