In Johns latest heart-related video, he has his friend/cardiologist with him discussing bloods and his heart damage.
30-35% ejection fraction is not good, dead tissue in ventricle, etc. (65% is considered excellent).
(My 1 hater here w/ the 8 accts will be happy Im at 65%).

Could be life-changing. 35 years of "gears" could contribute for sure.
Hoping for the best for John, real good guy in the "industry" of "Fitness". (Dr. Evil Finger Quotes).