To improvise, you need mental and physical strength, and use whatever is available. To adapt, you have to be willing to change, if necessary, and using what is available in a new or different manner.
Succinct
You failed to understand improvise, adapt, overcome.
One does not always have time to imrove, you have to sometimes make do with the situation at hand. If you knew where the roigianl quote came freom, you might understand it better.
> I invented that Motto