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is that one tought or not...
thats the hardest of them all for me.. might be because of my metal rods in the back but yea if you have strong abs, this will do the trick
if you have the mind state to complete the p90x, i suggest that, you'll love the results
manson twists like someone above said
and simply sit ups with a 25 or 35 lb weight on your upper chest, tighten your abs while you do them for a more intense workout. do a ton, then do some more
the better condition you are in the faster you will see pregression