I was reading the accepted answer of What are the trade-offs of weight versus repetition? in which the user add this picture:
However I get surprised by the training tips given. According to the picture, to get mass muscle you should practice at least five times a week ! do 4 to 8 sets with 6 to 12 repetition.
Questions : Are those tips in the picture correct (scientifically ) ? What about the rest days that plays an important role in building muscles ? On the other hand, if this is not the convenient training way, what is the optimal sets-reps programs in order to get muscles mass , and how many times should one practice a week ?
Thank you in advance.