Daily breathing exercises has to be the number one priority for psychological resilience!
If you can practice breathing for just 5 minutes twice a day, morning and evening, this will reduce stress and anxiety, and help increase energy. Not immediately, but over a 2 to 3 week period, you will see a noticeable effect.

The great thing about breathing is that the exercises can be done anywhere – the main thing is that you’re focused just on the breathing.