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First BJJ class went 3 mins before I had to give up for the rest of the class (10-15 mins total sparring). People seriously underestimate how quickly someone will get tired from grappling in a situation like that when they have no experience.
Even crossfit dudes who can do pure distance running for much longer than I can and are washboard ripped and guys who played football in college can be sucking air after a 5 minute round and barely able to stand again while fat blue belts are ready to go for round 2.
The anaerobic endurance needed for competitive grappling is a different animal to most fitness enthusiasts and people who don't have experience in it tend to gas really hard really fast until they acclimate and learn how to control their heart rate through repeated training / sparring.