I do all of them too. And sometimes, I crack whatever joints or bones are there in my neck and spine - every now and then, one of them locks up and makes the same kind of sound as knuckles when forced.

I can crack my jaw. What about when you bend your fingers at the joints, I can crack those too.

Give your body some more mileage, you will get there.

After I broke my ankle (crushed between trees), they had to re-attach part of one of the bones (the ball part that goes into the socket) with 3 temporary pins. Once the pins were removed and I started walking again (after lots of physio), my ankle would swell up to the point where it would literally not move without cracking it first. Cracking would also instantly relieve 90% of the pressure and pain in the ankle for at least an hour or two, it was marvellous.

I've regained all of the extension motion and probably 70% of my retraction motion (moving toes towards knee), but only about 30% of the muscle strength. Unfortunately it still swells up after long periods of standing or hiking but I'm rarely able to crack it anymore, and really wish I could on those bad days.