Jay Cutler on Instagram: "Not everybody’s born with that crazy high peak, we all know most of it’s genetic, but that doesn’t mean you can’t build what you’ve got. Single-arm dumbbell preacher curls let you isolate the bicep, control the movement, and really squeeze at the top. Focus on that full stretch and contraction every rep. That’s how you shape your best peak. #JayCutler #MrOlympia #Armday #Biceps"