My training was based on concentration, and it's impossible to cheat when you are concentrated
Genetics help to some degree, but the most important thing is the mind and the spirit. These two are even more powerful than physical characteristics that are passed on.
Trust me when you love something you don't need motivation.
Yes it is better to keep training even if your muscle is still sore.
I love to be sore and when I feel sore I train even harder.
A bodybuilder is a sculptor who carries with him his own material.