From the website:
Electric Shock Therapy:
Sprint through a field of live wires some carrying as much as 10,000 volts of electric shock. Watch out for hay bales and deep mud, or you will face-plant into some electrifying mud. Some Mudders℠ try to stealthily wind their way through the wires without getting shocked, while others barrel forward to get through as quickly as possible. Either way, you are guaranteed to get zapped with as much as 10,000 volts of electricity and it does NOT tickle. This is typically the last obstacle Mudders must overcome before they cross the finish line.
That just doesn't seem fun or sensible to me. It is not in line with one of my my core philosophies (avoiding electrical shock at all costs), so I will choose not to do it.