5. Boa Constrictor
If you’re the least bit claustrophobic, beware. This obstacle challenges your mental capacity to wiggle through uncomfortably tight spaces. A series of connected pipes runs up a hill through freezing mud. You have to pull yourself along the tunnel walls to the end.
Hint: Your legs won’t really help you with this one. Instead, use your arms to reach ahead and pull downward squeezing your body through the pipe. Don’t make the mistake of trying to use your legs like most first-timers. This will only slow you down.