I've learned to look at practical shooting positions in the same way I look at tying knots:
A good knot is one that is easy to tie, does what you need it to, and is easy to untie.
A good shooting position is one that is easy to get into, is stable, and is easy to get out of.
With training, you can start the long and never-ending road of mastering positions.
The combat kneeling is probably my favorite, and one of the most challenging for me to get good at.
At first glance, you'll think these studs are just doing your everyday kneeling position. Look again at the details:
* Base support from the trail leg
* Elbow position in relation to the knee
* Leaning forward
You can take this and make it even lower by wedging the magazine and pistol grip over your knee, if you are flexible enough.
Once you build this position up well, then sling into it, you can be surprisingly stable. Kneeling is inherently one of the most unstable positions when gotten into haphazardly. If you break it down and build up the foundation with that trail leg, lean into it, no elbow on your patella, but distal triceps just above the elbow forward of the patella, with your hips driving the Natural Point Of Aim, or get even lower with the magazine knee wedge, you can really make this position work for you in ways that will make kneeling fun and doable.