Begin by laying on the floor, knees bent and feet planted on the ground. Grab the dumbbells in your hands and lower them onto your chest, making sure they are touching.
Press the dumbbells up, while keeping them together, until your arms are straight. Then lower them back down to complete one rep, making sure to stop just slightly above your chest.
Don't be afraid to use heavier dumbbells for this exercise. Because you are laying on the ground, you have more stability, which can help you increase the weight, reps, or both.