One of the most potent acupuncture points is Stomach 36. It is located 4 finger widths below the kneecap and 1 finger width lateral to the tibia. A simple way to stimulate this point is with percussion using the palmar surface of the fist.
Tapping it 50 times daily in this manner helps activate its benefits. Among its many benefits are strengthening the qi (vital energy of the body) and nourishes the blood. It helps tone the digestive organs.
Try it first thing in the morning. Do both sides at the same time for 50 taps. It's a nice way to wake up.
If you're more visual in the location, just google it under "images" and you'll get a good sample of pictures. I've attached a picture as well.