To make this exercise easier, you can bring your feet closer towards the bench and allow your knees to bend.
Upper region of your tricep.
Lower abdomen, from just above your belly button to your pubis. The lower half of the six pack abs.
Lower tricep, close to your elbow.
Outer sides of your abdomen.
Outer region of your tricep.
Upper abdomen, from just above your belly button to your sternum. The upper half of the six pack abs.
Bodyweight
This means that the exercise requires you to use your bodyweight as resistance but you also need other equipment to successfully perform the exercise.
Flat Bench Without Rack
If you can't find this bench, consider using a flat bench with rack instead. If your exercise requires you to use a barbell or bar, you cannot substitute. If you do not need to use either, you probably can substitute.
Exercises that target the same primary muscle groups and require the same equipment.
Exercises that target the same primary muscle groups with different equipment