Squeeze your lats at the bottom of the movement, and squeeze your chest muscles at the top. This ensures they are properly engaged. The starting position should see a very slight arch in your back and arms, but keep it minimal. Focus on pulling your belly button in toward your spine to ensure your core muscles are fully engaged.

To do a dumbbell pullover, lie flat on a bench, hold a dumbbell with both hands above your chest, then lower it back over your head and return to the starting position, keeping your arms slightly bent throughout the movement. A dumbbell pullover mostly works the back and chest muscles.