Place your hands directly under your shoulders.
Position your feet hip-width apart.
Maintain a plank position; your body should be in a straight line from from the back of your head to your hips.
Keep your neck neutral, keeping it in line with your shoulders.
As you lower, keep your elbows close to your body.
Let your butt sag or stick up.
Tilt your head up or tuck it in.
Allow your shoulders to come towards your ears.
Make it easier
Widen the distance between your feet for better stability.
Or perform the pushup as described above, but rather than starting in and returning to a plank position, do the pushup with your knees touching the ground. Just make sure to keep your back and thighs in a straight line.