Avoid pulling on your head with your hands because it can lead to discomfort in the neck area later on.
Upper abdomen, from just above your belly button to your sternum. The upper half of the six pack abs.
Lower abdomen, from just above your belly button to your pubis. The lower half of the six pack abs.
Outer sides of your abdomen.
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.
Decline Bench Without Rack
If you can't find this bench, consider using a decline 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
