You often see a fighter lock in a guillotine, get really close to a submission, but the guy doesn't tap and he needs to let go. This often leads to a turning point in the fight with the fighter who almost had the tap being too gassed to keep up his former pace. If you remember Penn/Hughes 2, BJ seemed to gas this same way, but from a triangle. So my question is: Do any of you who train for MMA or sub-wreslting train for this? It almost seems like a isometric flex - or flexing as hard as you can for a point in time, then back to cardio. any thoughts?