Lie on your back in a comfortable position with your knees bent as shown. Place one hand on your stomach. Rock your pelvis up, that is bring your hips towards your belly button and press your back into the ground. You can place one hand under your lumber spine and use this as feedback as pressing into your hand will ensure your are rocking your pelvis in the correct direction. As you rock up squeeze your tummy by drawing your belly button down and towards your spine. Hold the squeeze for the duration recommended by your clinician before relaxing. This completes one repetition.
Repeat for the number of sets and reps indicated by your clinician.
Practice makes perfect but little and often is best whilst you are getting the hang of this one.