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Yes you should breath out on the up (suck in muscle) and in on the down,(relaxing the muscle) that will put full contraction on the muscle.
If your looking for six packs, you need way more. Granted sit-ups put pressure on your back, but they pull the entire top half of the ab. Crunches only pull the top of the top half.
Add 'Rocky ups" the side to side motion to build the sides, and the mid ab. Then you must focus on the lower ab, either flutter kicks, or 'supline bicycles' to finish the look. Don't forget about the leg ups either, use the the rack, and pull 1 set straight, 1 set left, 1 set right, then repeat.
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The Lizzie Palmer Tribute
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The Last Shot
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