The muscle nobody showed you

There is a muscle in your body most people can't find on the first try, and nobody put it in a gym.

Arnold Kegel was a Los Angeles gynecologist who, in 1948, got tired of operating on women for incontinence after childbirth. He built a small device to measure the squeeze of a muscle his patients didn't know they had, and then he taught them to train it: contract, hold, release, in sets, daily. The exercise took his name. It is now the first thing a pelvic physiotherapist prescribes for women after birth, for men after prostate surgery, and for anyone past fifty who has quietly started planning their day around bathrooms.

The pelvic floor is a sling of muscle from the pubic bone to the tailbone. It holds the bladder, the bowel, and in women the uterus, and it works with the diaphragm every time you breathe. The floor drops on the inhale and lifts on the exhale. That's why a Kegel done while holding your breath is only half the exercise, and why the second month, which is about breathing, starts here.

The research is clear that it works for most people who do it consistently for three months. One honest note: some people have the opposite problem, a floor that is too tight and can't let go, and for them the squeeze makes it worse. That is why pelvic floor physiotherapists exist, and why this letter points there at the first sign of pain.

This key is in the month called You because knowing your body means knowing the parts nobody taught you about. Most of us learned our bodies from sports and mirrors, which cover the outside. This is the first key about the inside, and it's a quiet, private, slightly funny place to start. That's fine. Shut the door.