Work out
People who jog regularly often talk about a "runner's high," which is a release of endorphins that happens when they hit a certain point in their workout. Dr. Fuhrman notes that the science of endorphins-from-exercise is controversial, and that some medical professionals believe the positive feeling you get when you meet a physical challenge, rather than the exertion itself, is what stimulates the endorphin release. But whatever the cause, exercise has been proven to enhance mood. Dr. Fuhrman recommends prolonged activities such as cross-country skiing, swimming, tennis or a long cardio workout for the best effects.
Endorphin factor: 2 to 4. It's all about intensity and duration.

Have an orgasm
"I personally think that having an orgasm is a great way to get a rush of endorphins," says Dr. Fuhrman. "You may have to run for an hour to get a runner's high, depending on your body. Sex is less effort." (And, ahem, much more fun.)
Endorphin factor: 5, even if it's a quickie.

Get moved
We're not talking about packing up and renting a U-Haul. Dr. Fuhrman says that viewing beautiful art, watching a touching dramatic scene or even listening to an inspiring piece of music can produce endorphins. "A person who gets pleasure in life, from whatever source, will keep endorphins at a healthy level," he says.
Endorphin factor: 2, unless you're overwhelmed with emotion (think swooning, tear-filled eyes and a quickened heartbeat); that counts for 3.