On your side position your elbow under your shoulder.
Straighten your body and hold.
Hold for the desired amount of time.
Positioning elbow too far up.
Hips caving down.
Torso not being straight.
Place elbows under your shoulders.
Raise torso off the ground, keep a flat back and hold.
Extend arms one by one and lower them back down, repeat.
Dropping hips down.
Raising glutes upwards.
Slouching shoulders.