Stand up straight facing a sturdy surface the height of a sink or worktop.
Place your hands onto the worktop slightly wider than shoulder-width.
Lean against the worktop, and walk your feet back so that you have a straight line from your head to your feet.
Keeping your legs and body in a straight line, bend your elbows, bringing your chest and hips in towards the worktop.
Make sure your body stays straight.
Push through your hands to straighten your arms back out again.
Continue this movement.