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  1. P

    Do Jackknife Exercises Work?What About Planks Do They Work Also?

    I want to tone my stomach for the summer and I'd like to know if jackknife's and planks work to tone your stomach.Fyi I'm doing these on the wii fit :)
  2. P

    Do Jackknife Exercises Work?What About Planks Do They Work Also?

    I want to tone my stomach for the summer and I'd like to know if jackknife's and planks work to tone your stomach.Fyi I'm doing these on the wii fit :)
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