Your booty! Well, the gluteus maximus muscle, to be precise.

You probably heard that the strongest muscle on your body is your tongue but LiveScience explains that there are different types of strength and it’s not easy to determine which muscle is the strongest. For example, the calf muscle can exert the greatest force, while the jaw muscle exerts the most pressure. And the gluteus maximus (your booty) is the biggest muscle in the human body. Fortunately there are tons of exercises which shape your butt and make it super strong.

More facts about the types of muscle strength can be found here.