The brachialis is the often-overlooked muscle between the biceps and triceps. Training your brachialis is a great way to help "project" a massive arm. Why? Because as the brachialis develops, it pushes your biceps and triceps further away from one another, making for a wider-appearing arm.
The standard hammer-grip curl is good, but I prefer the cross-body variation shown here. Grip the dumbbell as hard as you can throughout the rep.
Nobody cares about injuries (boring!) until they get one. That's too bad, because sooner or later your knee, shoulder, hip, or back is going to start barking like a coonhound on the hunt. Even babes aren't immune.
Being strong isn't enough. You need to be strong for your size. That's the difference between relative strength and absolute strength. Here's what will get you there.