what you think effects your body, what you do effects your mind.
e.g. worrying will cause your heart rate to increase ad your breathing to quicken, breathing slowly will reduce your heart rate, a lower heart rate will reduce your sense of anxiety.
your body is a sensor, your mind is the computer. emotions are like the ships diagnostic warnings from star trek.
edit:
id add that this is why “mastering your emotions” using the control sense of mastering, doesn’t make sense.
you don’t want to control your diagnostics, you want to be great at reading them and making decisions from them, aligning with them if you will.