The Knee Tuck or Jackknife is a challenging exercise that works your body from head to toe. The exercise is somewhat similar to Rollouts, requiring your lower abdominals to contract isometrically, stabilizing your spine.
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How To:
Do wide grip pull ups on Gravitron with slow negatives
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Start a wrist powerball using the thumb technique
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Work your core with medicine ball soccer throws
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Exercise with a thigh master
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Have sex on a Swiss Gym Fit-Ball (sexercise)
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Do alternate power stability ball pikes and knee tucks
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How To:
Build an Exercise Machine
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How To:
Get a flat stomach with a fitness ball workout
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How To:
Start a wrist powerball with a string
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How To:
Do a hand to foot stability ball pass
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How To:
Use a stability ball for seated alternate cable rows
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How To:
Do push-ups on a Swiss ball
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How To:
Do stability ball backbend holds
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How To:
Do a standing incline press
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How To:
Do a standing incline fly
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How To:
Do ab rockers
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How To:
Do advanced side-lying leg work on a Pilates Reformer
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How To:
Make a quick and easy homemade wrist roller
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How To:
Do side crunches on an exercise ball
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How To:
Practice proper chest focused Gravitron machine dips
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How To:
Do wide grip pull ups on Gravitron with slow negatives
-
How To:
Start a wrist powerball using the thumb technique
-
How To:
Work your core with medicine ball soccer throws
-
How To:
Exercise with a thigh master
-
How To:
Have sex on a Swiss Gym Fit-Ball (sexercise)
-
How To:
Do alternate power stability ball pikes and knee tucks
-
How To:
Build an Exercise Machine
-
How To:
Start a wrist powerball with a string
-
How To:
Do a hand to foot stability ball pass
-
How To:
Get a flat stomach with a fitness ball workout
-
How To:
Use a stability ball for seated alternate cable rows
-
How To:
Do push-ups on a Swiss ball
-
How To:
Do stability ball backbend holds
-
How To:
Do a standing incline fly
-
How To:
Do a standing incline press
-
How To:
Make a quick and easy homemade wrist roller
-
How To:
Do advanced side-lying leg work on a Pilates Reformer
-
How To:
Improve upright posture & balance with an EXO chair
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How To:
Do a "Double Hoof" routine on a CoreAlign machine
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How To:
Do a ball plank roll out on an exercise ball
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