Exercise regularly
Do aerobic workouts
Do strength training
Try high-intensity interval training
Laugh often
Listen to music
Dance
Spend time in sunlight
Get enough sleep
Eat spicy foods
Drink dark chocolate in moderation
Meditate
Practice deep breathing
Have sex
Get a massage
Accomplish challenging goals
Socialize with friends
Try acupuncture
Chew gum
Take a cold shower
Do yoga