Dude, Smolov IS endurance and cardio, or dare I say you already forgot the 4 sets of 9 day? That day had my heart RACING.
The beauty of Smolov is that is simultaneously improves everything, all by squatting, bigger bench, deadlift.
James 1:16-17 ESV
Do not be deceived, my beloved brothers. Every good gift and every perfect gift is from above, coming down from the Father of lights
With God's help...Mens sana in corpore sano