Andrew Huberman· PhD
More eccentric means greater chance of muscle damage soreness. So if you take something and magnify it across 30 minutes, or even five minutes, but of maximum exertion, you have a recipe for blowing up. You can imagine I haven't run in forever, and I've just, I wasn't okay, I'm going to get into my zone two training, whatever. And I start jogging, I'm going to do, you know, I remember when I was, I used to be able to do 25, and you just do a 25 minute jog. The amount of eccentric landing that just occurred on every single step, because you're never, with running, even slow running, you never have two feet on the ground at the same time. So it is a one foot land, one foot land, your entire body mass plus gravity onto one leg at a time, repeated now hundreds of times. That eccentric landing is going to cause tremendous soreness. Your quads are going to go. You're probably going to get shin splints, which is what, this isn't, those are entirely caused by eccentric landing, and when the tissue is not ready to tolerate that. If you're not landing correctly, this is when knee pain happens, back pain, shoulder, neck pain, 'cause of movement compensation. So anytime we start pressing to fatigue, let's be very concerned with there. ... A really bad strategy would be to jump in and do say circuit training class that involves a bunch of box jumps, right? This is not a good way to do your first foray into conditioning. You're going to get incredibly sore because you're jumping and landing. You're now looking at three to 10 X body weight in terms of absorption, with a single land, even if you're just jumping. So be careful of that, in any of those endurance areas of exercise choice.