Golovkin's Stamina & Chin are Unreal

Agreed, his stamina and chin are top notch. Canelo Is lacking In the stamina department but also has a phenomenal chin.

He was pretty tired but has always been very good in managing his recovery time by taking deep breath every time he can Also his thick torso suggests he has a high volumetric rib cage and so the lungs, so he can take good amounts of oxygen into the blood at every breath In addition, he doesn't waste much energy in defence since he puts his high guard on and and slips punches with minimal movements and this helps saving energy.

Any notion that GGG has slowed down were put to rest. He finished the fight as he started, walking down Canelo with plenty left in the tank, and barely budging an inch in the face of Canelo's best punches. Never say he's a gasser or hasn't faced someone who hasn't tested his chin again. Chin yes, stamina I don't know, he looked spent late in the fight against Jacobs, Canelo couldn't keep up a high pace because of the extra weight he was carrying, so the fight was at a relatively slow pace because of Canelo choosing to lay against the ropes to take breathers and GGG didn't go for the KO.

He has slowed down a lot in intensity. His stamina is OK.