What is "overexertions"

Usage examples of "overexertions".

I intend to die at the age of one hundred years or more, in a soft bed of overexertions with a young and willing doxie, not with a gutful of sharp steel or on the horns of some wild bull, thank you.

And once she properly recovered from her overexertions she should be right fine.

Or had his long sequence of overexertions and relapses aggravated the damage enough to cripple him?

On the list of overexertions which his doctor had ordered him to avoid, climbing stairs had stood first, underlined in red ink, ahead even of "excessive sexual activity.