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Swiss Ball

Fitness Systems

Swiss Balls Stability Balls Physioballs
A great fitness tool for strengthening the back, abs, and more!

swiss ball prone jacknife The Jacknife Basic

Tuck both knees so that your heels touch your buns.

11 more exercises - beginner, intermediate, and advanced

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Animated Exercises

Jacknife Basic

See the
Jacknife Advanced

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