SPARTAN RACE - WOD question

Has anyone on here done the Spartan Race? Have you done the Work Out of the Day that they send you? If so, can someone please tell this Spartan virgin what a "Main Set" is? Is that the list of exercises they have listed after the "main set" line?

Just learned what a burpee is. My knee is not please. LOL


Thanks for any help, suggestions, tips.