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Do you mean lifting the weight up with your feet? Pull ups don't really use the abs, do they?

Try a pull-up and see how tense your abs feel. I am not sure how exactly they are used in pull-ups, but I feel like my entire body flexes when I do a pull-up. Abs especially.

to show how the abs can be worked, go to a pull up bar with a spotter. have them hold your legs bent while you hang directly below the bar. do 5 or 10 pull ups. now have them pull your legs back about a foot or more and do 5 pull ups. usually i can feel my abs strain pretty hard. kiping pull ups work a lot of your core but can be dangerous on temporary pull up bars attached to door frames.

Ho ho ho, try 3 sets of 10 with even 5 kilos, then tell me that :-)

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