The structure of the body should be correct and whole. The spine should be straight and the body relaxed, but not floppy.
Slow exercise helps develop correct form.
When squatting have your toes pointing forward, not outwards. That way your hip joints are not forced out or stretched incorrectly. This can be used to heal hip joints that have been damaged by improper stances or exercises performed in other martial arts.
Practice squats with your back, heals and head against a wall. There should be no gap between the spine at the lower back and the wall.
Do not over reach when kicking or punching. Do not try to reach for your opponent. Keep correct form.
Do not lean into the strike.
When hitting or kicking any shock from the strike should not enter your body. If the form is correct it should have a natural exit point.
The same principle applies to shooting handguns using the approach of the system. The arm should be slightly bent. This way the arm absorbs the recoil.
Practice having your partner stand in any kind of martial arts stance or in a position as if they have thrown a punch. Analyse the way they are stood and look for places you can effect their posture or balance with the minimum of effort. Have your partner give you ideas if you get stuck. Also notice how sometimes you push in one direction and only meet resistance, but pressing the same spot in a different direction causes you partner to fall or adjust their form.