One note: some of our exercises will put the client into lumbar extension, and the casual/untrained observer will think "well, this person doesn't need lumbar extension so that exercise won't be good for them". But there's a fundamental distinction between being in lumbar extension with the lumbar paraspinal muscles engaged and working, or relaxing.
For example, I've had clients with lumbar hyper-lordosis (excessive lumbar curve) where I put them in the Static Extension Position ecise heycal references above, and one of my intentions is to use the position to get their lumbar paraspinals to release. They come out of the ecise with a less anterior pelvic tilt and a more moderated lumbar curve.
In other words, the functional purpose of an ecise is not always readily apparent.
Volkl Organix V1 Pro
Pacific Gut 17 gauge mains at 54lbs/MSV Co-Focus 17L gauge crosses at 50lbs