Folk say that men have waist pits.

Having a lumbar fossa means you are unhealthy.

If a man has a lumbar fossa, that's not good, because this position of the lumbar fossa is very close to the kidney. If this position collapses, it often indicates kidney deficiency.

The "lumbar fossa" are two concave pits on the back and waist, which are located above the gluteal sacrum and on both sides of the lumbar joint. Medically, it is called "Michael Siling", commonly known as "waist nest".