verb (used with object)
to exert excessively.

1840–50; over- + exert

overexertedly, adverb
overexertion, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To overexert
Example sentences
If you choose to bike down, don't overexert yourself.
It is critical to begin your mental aerobic exercises at a level that
  stimulates, but does not overexert.
If you have to shovel snow, don't overexert yourself.
People with heart or respiratory problems should be especially careful not to
  overexert themselves.
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