Typically anything that causes you pain...should be evaluated by a doctor. I didn't know what planks were...so I looked it up:
http://www.wikihow.com/Perform-the-Plank-Exercise
Look at what happens to your feet and toes with this exercise!
Anyone with foot pain, should seriously avoid this!
Pain is a signal from your body that something is wrong. Ignoring it therefore is serious, unless a trained PT or doctor says to.
Patients with arthritis for example are instructed to listen to pain and not over do anything that creates more pain for them.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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