The weight of the bar is in your hands. Keep your joints stacked and in a straight line. Unrack the bar in this position.
Push Press Grip
Think about setting up almost like a front squat, fingers underneath the bar. Your body actually unracks the bar. This is an open grip. Your thumbs are not wrapped around the bar at the beginning.
So you think you know how to do plain, simple, Incline Dumbbell Curls, huh? Well maybe you do, but there are at least a couple of trick you can pull to make the movement a whole lot more effective.
It happens every time I write an article or give a workshop. Someone asks me, "So, uh, Dan, do you think I should do it five times a week or should I do it twice a day?" It doesn't matter what "it" is – one arm lifts, Tabata front squats, Olympic lifts–I always get the same perplexing response.