The acupoint Liver 3 is recommended for muscle cramps in general, and specifically for foot cramps.
This self-care option:
• Aims to relieve muscle cramps
• Frequency: Repeat whenever cramping occurs
• Contraindications: None known
• Also beneficial for headaches, allergies, arthritis, eye strain
Technique: Place your right foot on your left thigh. Use your left index and middle fingers to massage the area where the bones of the big and second toes meet, for about one minute. You will feel a “zingy” or nervy sensation when you find the point. Repeat on your left foot.
—Excerpted from the book Healing Self-Massage: Over 100 simple techniques for re-energizing body and mind, by Kristine Kaoverii Weber