★★★★★
I am a female in my 40s and have had good success using inversion for pain and cramps in my calves and feet. I don't use an inversion board, but instead just use either a shoulder stand or for a gentler approach use a firm foam bolster to raise my hips about 8 inches. I find lying in this position for several minutes most days cures my leg pains. In the past my calves cramped so bad that I could barely put my heels down on waking in the morning, but using this inversion technique regularly has got rid of the problem.
