Muscles targeted
Lower abdominal

Starting position
Lie down on your back. Put your arms back behind your head and hold on to a weight or a chair leg. Keep the knees slightly bent.

Movement
Pull your pelvis and legs up. Without letting your back move from the floor so that your knees are above your chest and now unroll the movement until you return to the position at the start.

Repeat the exercise 20 times. Try to keep it slow to really work the muscles.