Dynamic apnea, involving voluntary breath holds during exertion, can improve CO2 tolerance and nervous system regulation.

“So, we can almost use some of this hypoxic work where we just put you into a little dynamic apnea where we ask you to work, do a little breath hold of some kind. Suddenly, you're going to have to touch that range of motion. You're going to have to get caught up. You're breathing all the way out. You're being a little bit more intentional. And then we've already set up your brain to be a little bit more CO2 tolerant. And we've done a couple other things. So, the first time that that lactate starts spiking, CO2 starts to climb, your brain is like, it's fine. We've already done this a bunch. So, it's like repairing the nervous system.”