How does water ballet breathe underwater?

Synchronized swimming, also known as water ballet, can't breathe underwater, and it depends on holding your breath.

The average person holds his breath for only 1-2 minutes; Take a breath, spit out half, and then take a deep breath, you can hold your breath for 3-4 minutes; Regular long-distance running can increase lung capacity, and then you can hold your breath for 5-6 minutes. Try to hold your breath, and then inhale pure oxygen, you can hold your breath for 10 minutes; Special talents who hold their breath after the above exercises can hold their breath for more than 20 minutes; The length of holding your breath can be practiced.