Using Dumbbells and a bench 

With a comfortable working weight 

Lay on the bench with your face up holding the dumbbells with an overhand grip at chest level 

Safely push the dumbbells up toward the ceiling slowly  

Without locking out your elbows/ hyper-extending your elbow 

While keeping tension, slowly bring the dumbbells down toward your chest to complete your repetition

Once completing a repetition repeat process