Slide your butt off the bench, while keeping your hands firmly planted on the bench, and move your feet out a bit so your knees form a 90-degree angle.
Lower your body by bending your elbows until they're at about a 90-degree angle, while keeping your back close to the bench.
Push your body back up using your arms and chest muscles until your arms are fully extended, but not locked at the elbow.
Repeat these steps for the desired number of reps, ensuring to maintain proper form throughout the exercise.