Start from a kneeling push up position, feet together, hands about shoulder width apart. Engage your core by assuming a Posterior Pelvic Tilt (Tuck your tailbone, eliminate any arch in your back). Squeeze your glutes.
Generate total body tension, gripping the floor, squeezing your armpit, glutes and core engaged.
Now begin bending your elbows, and keeping them tucked in to your sides. Lower your chest to the floor, maintaining tension throughout the movement until your body contacts with the ground.
Push back to the starting position with a help of your body. Repeat for the required amount of repetitions.
Avoid flaring your elbows. Don't allow your hips to sag, or back to arch at any point, your whole body should be engaged throughout.