Jackknife Challenge
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What is this?
This is a challenge exercise for the abdominals. Your trainer challenges you to a how-long-can-you-keep-going competition.
Benefits
Jackknife Challenge:
- Strengthens the abdominal muscles.
- Tones the abdominal muscles.
Equipment required
This exercise requires:
- The Wii Balance Board
A mat or soft surface is recommended.
MET
Jackknife Challenge has a MET of 2, meaning that it is a light intensity activity.
How to do it
The basic exercise in Jackknife Challenge is exactly the same as the exercise in Jackknife. Like all the challenge exercises, Jackknife Challenge is initially locked. You unlock it by playing the longer version of Jackknife at least once.
- Lay on your back with your arms stretched straight behind you, your knees bent, and your feet on the Wii Balance Board.
- Keeping time with the whistle, so that you light up the red bar, raise your upper body and your legs so that you form a 'V'. Your arms should be straight, your knees bent, and your lower back flat on the floor.
- Hold the position for a moment.
- Lower your upper body and legs. Your feet should come to rest on the Wii Balance Board.
- Repeat as many times as possible, or until the trainer gives up, whichever comes first.
On the Wii screen, the trainer will do the exercise at the same time as you. As said above, the game is played in units of ten reps, and each time you play, there is a specific number of units, after which the trainer gives up. This number is not revealed except by playing until the trainer gives up. Of course, the trainer watches you do the exercise, and if your performance is off, the trainer stops you at that point.
The criterion for being off is the same criterion as for scoring well on Jackknife. If you are off badly enough, the trainer will stop you.
Scoring
Your score is simply the number of reps you complete before either you fail badly enough or the trainer gives up. If you win, the score is a multiple of ten, as the trainer only gives up at the end of a unit. If you lose, the score is however many reps you completed.
Problems
- Don't attempt to touch your legs with your arms as you might strain your back.
- Keep your head and neck in line with your upper body; don't lead with your head as this can cause you to strain your neck muscles.
- Keep your movements fluid.
- If you have problems raising your upper body or legs, do what you can and work at it until you gain more strength and flexibility.
Silliness
The challenge exercises are the place to see the trainers exhibiting some human weakness. They will hang their heads when they "lose", and they will crow over defeating you. And they will sound tired, in a way that they never do in the non-challenge exercises.
