Do You Really Need to Train Intensity?

If you do 20 sets of legs on a day, how much is that 20 set word? Because your performance will be horrible, because there's already muscle damage. And fatigue. On the other hand, your muscle doesn't care about the weight. Similar with the blood fo restriction, and your muscle just experiences it as difficult. So i wouldn't be surprised if your twentieth set is pretty worthless. But at the same token, i wouldn't been surprised if it's just as valuable as your first set. Even though your performance is horrible, your your muscle is like, again, set to fatigue.