Exercise 6 could actually injure you if it is done incorrectly. I would not suggest this exercise unless you look as fit as the woman in the picture or regularly practice Pilates or effectively know how to engage your core muscles.
The reason these exercises have been choosen is because they are on the NHS choices website and there have been no adjustments to how to perform these exercises. The NHS have deemed their explanations of the exercises sufficient to prevent injury. I appreciate your concern but I would not knowingly put something on this site I thought would cause injury. All I am trying to do is help with the motivation for some of our members to keep up with their core work. I have used the most reliable source that I could think of to do this.
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