Before mastering the art of vertical swimming, I recommend learning back floating.
Back floating gives you access to all of the air in the world. In order to conserve energy, you can easily switch between treading and back floating. Take a deep breath in and rest your arms and legs. I have the video about how to learn back floating in 7 steps. Watch it now to learn this crucial water safety skill:
Let's start with this easy skill. I call it drown proof technique.
Take a deep inhale and put your face in the water. Position yourself vertically in the water as if sitting on a chair. Knees bend, arms extended in front. Start moving your feet as if you are pedaling your bicycle. Move the water by doing leg kicks. Keep both your arms in front of you inside the water. Stay in the water, and practice pedaling for a few seconds.
Ok, well done. At some point, you have to come up and breathe.
We kept our arms inside the water extended in front so we could use them to leverage our head out of the water and breathe. Press both of your arms down toward your hips. Once your head comes out of the water, take a quick breath and let gravity push you back inside the water. Continue pedaling with your legs until buoyancy pushes you back to the top.