Have you realized that when you go heavy on the bench you tend to drive you elbows forward, to the side, like a powerlifter bench? wrong.
same happens when you do lat pulldowns or pullups, when the set gets heavier you drive you elbows forward. Wrong.
In the curls, when it gets heavy you drive your elbows out, i've seen this countless times on hammer curls. Wrong.
they key is keeping the elbow positioning. Today i did back and i the pulldowns i focused on keeping the elbows out and perpendicular to the torso. Got a greater pump in the lats and over upper and middle back.
same for chest, elbows out.
for curls, elbows in.
want mass? elbows are the key.