This second exercise will truly work the already fatigued lower abs to their max.
Start in the same position as above i.e. lying on the floor with hands supporting under the hips.
Keep your knees bent and roll them up towards your chest so that your pelvis comes off the floor. This will strongly contract the lower abs. However do not return your feet to the floor. Keep them just off during the entire set.
Aim for 20 controlled reps at a steady pace. If this is a problem then start with less and slowly build up.
Rest 10-20 seconds and then do exercise No.3
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