So, here is my assesment after now a bit more than a month of use.
For the GYM, they are fine. They don't really seem to want to fall out (maybe lying flat on one's back for bench or stretching or something) but most times they are fine. Sound quality is good and I find them very light and effective.
For running, totally different story. IF they fit snug in your ears, you MIGHT be okay, but if they aren't snug (either fit flush or behind that little fin on the front of the ear lobe) they are going to want to jossle OUT and you will constantly be trying to seat them and make sure they are back in the ear. THIS is a DISTRACTION while trying to focus on the running part of running. Granted, I only run about 10 min/mile pace (6mph) but there is enough moving around to make it pretty annoying. I've moved back to my mpow in ear noise isolators and they are much better for that purpose. As I don't run with my phone (just the apple watch with music and paired to either via BT) I don't miss any of the enhance airpod functions with this setup.
I've tried some foam covers, to try and make the fit better. Doesn't really work. I've tried some attachable cords and that actually seems to make it WORSE. The jossling of the cord either in FRONT or BACK of the neck, makes the looseness of the airpods in MY ears worse and they fall out MORE often. At least they don't fall on the ground, but still it's not a workable solution for me.
YMMV