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What exactly is a jackknife crunch?

2006-10-21 04:17:19 · 1 answers · asked by Privatize 2 in Health ➔ Diet & Fitness

1 answers

Here is a basic guide with pictures for you:
http://www.concept2.co.uk/guide/guide.php?article=exercise_ten

2006-10-22 10:17:00 · answer #1 · answered by Daniel 6 · 0⤊ 0⤋

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