There's a difference in these color/obstacle/mud runs depending on course length and difficulty. Anything 5K and under is a gathering of fats getting in the way of people who can destroy the course if they weren't stuck behind fatties. If you enjoy these obstacle runs choose ones that are known to be hard with stiff penalties, terrain and are at least 6 miles in distance. You might see a sprinkling of very small fats but it's a Shitlord/lady playground.  Warrior dash attracts the most fatties since it's basically a beer party with a few cargo nets thrown in. The new half Tough Mudder was designed because fatties bitched that the regular one is too hard. Spartan races has a ton of fatties for stadium sprints and milder terrain courses. You won't see many fatties at Spartan Beast and Ultra Beast levels as long as the terrain is hard.