>>76623557
>stronger
No. You do not have to be much stronger to increase the number of pull ups you are doing, unless you're 120kg+. If it's your honest opinion that you have to be 6-7x as strong to do 6-7x as many pullups at the same weight, then you are retarded.
>that much more endurance
You do understand why you fail doing endurance exercises, right? It's not that your muscles are physically incapable of doing more, it's that your pns limits what your are doing to prevent muscle injury. It does this because of the (percieved) increase in acidity within your muscles, which can cause significant injury in the long term. You are physically capable of exercising until you get rhabdo, but in 99% of cases your brain and body wont let you.
This sort of thing is extremely well documented in tweakers and methheads.
Speaking of which, do not do cardio on any drug like that, because you can and will give yourself a heart attack.