ETA- cricket yes all fours is good but nope reclining is not, its actually pretty much hands down the worst position to birth in for lots of reasons (but very convenient for Dr/mw viewing), it compresses the pelvis making babies decent more awkward and puts pressure on perineum also. Having said that my first two were in this position and it is doable just if its possible to be another way its almost always going to be better

Funny - all my babies have been born with me semi-reclining. It's the one I've chosen naturally, and moving out of it felt terrible! You can pull your knees up easily and open the pelvis more, although the tailbone will still be somewhat compressed. The old "classic" birth position - lithotomy, with you flat on your back and your legs up in the stirrups was a really lousy one.