This exercise will help to strengthen the muscles of the lower back.

Start/Finish Position	Mid point
Muscles Activated
Primary Muscle	Secondary Muscles
Erector spinae	Rombiods
Gluteal muscles	Deltiods
	Trapezius
	Hamstrings
Technique
1.       Lie on your front on a Swiss Ball with your legs over shoulder width apart (placing your feet against a wall may help with balance).
2.       Have the ball situated at the belly button 3.       Lean over the ball and place your hands onto your temples 4.       Then contract your back muscles and move your head, shoulders and chest away (upwards) from the ball. Breathe in as you do this.
5.       Rise until your neck, spine, and upper legs are in alignment.
6.       Hold for 3 seconds and then lower yourself back onto the ball Breathe out as you do this.
7.       Then repeat for the correct number of repetitions.
Where to feel the exercise
On the lower part of the back.

This exercise is from the Core Workout Booklet which you can buy from the shop

Dan Bennett