Mass Nutrition What Are Good Tips To Build Muscle Mass In The Gym (not Talkin About Nutrition)???

What are good tips to build muscle mass in the gym (not talkin about nutrition)??? - mass nutrition

I'm a skinny guy, and I am always.

My sister is studying nutrition. So I covered when it comes to my diet.

That's what I'm lookin for what I am in the gym.
Techniques to do to build muscle mass.
I want my cut. I first apply. I am doing research on the side. But I just want to see what you mean.
Thanks