Drink a glass of water
Stand up and move around for 2–5 minutes
Take a few deep breaths
Get some sunlight or bright light
Splash cold water on your face
Have a small caffeine boost if it suits you
Eat a light snack with protein and carbs
Stretch your body
Do a quick walk
Reduce screen fatigue by looking away from the screen
Listen to upbeat music
Fix your posture
Open a window or get fresh air
Avoid a heavy meal right before needing energy
Rest your eyes for a minute