Lie on your back with your knees bent, your feet flat on the floor, and with your arms straight and pointing towards the ceiling.
Lift one foot off the floor and straighten your knee.
Press your foot against the floor and lift your hips up.
Try to straighten your hips so that you have a straight line from your shoulders to your knees.
In a controlled manner lower your hips back down, and repeat.
Keep your pelvis level throughout this exercise.
