seid probably isn't natty but you can achieve similar size/leanness natty, just not year-round. what makes seid so special are his insertions/genetics. In non-shoppped pics he looks to not be much...
if you are ale to do 80 sets of any muscle group you simply aren't training hard enough. OP has good leg genetics and can get by with it but for 95% of you *******s you are just setting yourselves...