Lie face down on the ground with your arms out straight overhead on the ground and your legs out straight behind you. Everything should be relaxed and your neck should be in a neutral position.
Then squeeze your glutes, back and shoulders to raise your chest and legs up off the ground. Try to get your chest up as high as possible as well as your quads. Keep your neck in a neutral position.
Hold up off the ground for a set amount of time then lower back down or complete reps.
Keep your arms and legs straight as you lift but do not lock them out. Do not bend your knees to try to get your quads higher up off the ground. Make sure to really squeeze your glutes as you lift so your low back doesn’t do all the work. And also make sure not to shrug as you lift your upper body up.