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  • Thanks for the upload. My buddy sent me a new workout plan to check out, and jack knives are featured for today's workout. Looks challenging.

    Dcowcow972 1 year ago

  • how2muscleguide has lots of free bodybuilding tips.

    BehindTheCurtain0 2 years ago

  • Cool I heard this is a good exercise..and if you are looking at buying that ab coaster..I heard the jack knife on the ball is just as good..maybe better (saves more money!)

    VeroniqueEmbrace 3 years ago

  • nice ass..... ill try the work out

    redfireponu 3 years ago 2

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