"Overcommit, be all in" means what in this text?
“Overcommit, be all in, and take massive levels of action followed up by massive amounts of more actions. You will create new problems and deliver at levels that will amaze even you.”

Question

Answer

To over-commit is to commit (to promise) too much, to be 'all in' means you have no hesitation, etc. 
You give more than 100% to your efforts, and your results will follow exceedingly too.

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