Do
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.
Don’t
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.
2. Plank
Do
Plant your hands under your shoulders, or slightly wider apart.
Squeeze your glutes. (That would be your butt.)
Keep your body in a straight line from the top of your head through your feet.
Tighten your core.
Tuck your chin.
Fix your gaze on the floor, either between or just beyond your hands.
Don’t
Let your butt lift or sag.
Lift your head.
Hold the position if your form is suffering — the only good exercise move is one that you do right.
Make it easier
Hold the position for a shorter period of time.