Make sure to concentrate on your abdominals!
Lie on your back. Bend your knees at 90 degrees in the air. Place your hands behind your head and neck, elbows out to the side. Squeeze your tummy muscles and raise your head, neck and shoulder blades off the floor while simultaneously lifting the hips off the floor, bringing your knees in towards your chest.
Slowly lower to start position. Make sure your elbows stay out to the side and your chin should not touch your chest.
Complete the move in 4 seconds.
16 reps rest and repeat.
Also read: 'I lost 16 kgs without exercise'