If you cannot squat low enough, start with a higher box, and gradually work your way down to a smaller one.
Muscles of your butt.
Muscles spanning the front of your thigh.
Muscles spanning the back of your thigh.
Lower abdomen, from just above your belly button to your pubis. The lower half of the six pack abs.
Center region of your back, spanning from the pelvis to just below the neck. However, parts of it are hidden beneath other muscles. The lower portion is the most visible.
Outer sides of your abdomen.
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.
Box
If a box is not available, you can use a regular bench instead.
Exercises that target the same primary muscle groups and require the same equipment.
Exercises that target the same primary muscle groups with different equipment