Go for a run
Running increases oxygen to the brain.
Write / sketch
Help you get ideas out of your head and make new connections.
Make noise
Create a distraction. Scream to let go of excess energy.
Be alone
Sometimes being alone can help to gather yourself.
Get into nature
Nature always provides positive energy.
Wander
Walking without direction is healthy and helps to gather thoughts.
Visit an art gallery
Looking at great creative cultural works can be inspiring.