If you have the flexibility, squat down further until your thighs pass the point at which they are parallel to the ground.
Muscles of your butt.
Muscles spanning the front of your thigh.
Muscles spanning the back of your thigh.
Muscles spanning your inner thigh.
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.
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.
Exercises that target the same primary muscle groups and require the same equipment.
Exercises that target the same primary muscle groups with different equipment
