Technique- begin in the prone position. Lift your arms and legs at the same time, keeping your elbows and knees locked out. Extend your back and release. Advantages- This is a great lower back exercise for stretching and strengthening. Faults- common faults include lifting your head to look forward, and not keeping knees and elbows locked out. Scaling- This can be scaled with smaller movements, or just lifting the lower body or arms at first. This can also be alternated by lifting your right arm and left leg, followed by your right leg and left arm.