Kyto Trim Now you have worked out the deep core muscles, now its fine to just do it work those outermost, rectus abdominis flesh. Now go ahead and do some crunches. If you'd like the greatest crunch exercises do these with a swiss ball. Scrumptious meals give you extension as well as flexion. You should not sit up all means in order to incur maximum profits. Do a crunch flex and flex stretch about 20 cycles.