75% x go until failure x repeat 4 times
With 5 minutes rest, they got 11% less reps on set 4 than set 1.
With intensity, number of sets constant, and rest times constant reps/volume had to drop.
True HIT Bros will be like, "how do you go to failure 4 times? If you really push, you can only go all out once." And they'll be mad the scientists didn't measure rib-cages.