you can also try doing the jack knives first, before you're tired from sets of the other exercises, until you've mastered the technique.
If your arms & legs are already tired from the other exercises, learning to do the jack knives is going to be even harder.
I've had to switch around the order of several exercises in order to avoid the aforementioned exertion migraines. I need to do "head down" exercises first.
You can always switch the order of the exercises back after you're confident you can do it.
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