The phrase "dumbbell pullover" refers to an exercise where you lie on your back and hold a weight with both hands. Then, you move the weight over your head and back down. It is a simple way to work out your upper body muscles. Full definition
Perform 4 sets with 8 - 12 reps of dumbbell pullovers with your elbows slightly bent. (fitnessandpower.com)
If you use dumbbell pullover exercise to open rib cage, you must work with light weights and avoid bending too much at the elbows. (bodybuilding-wizard.com)
Repeat steps 1 through 4 until you have completed the desired number of dumbbell pullover repetitions before slowly lowering the dumbbell to your chest and then the ground. (shapesense.com)