This is the 12502nd most frequent Polish word.
najprędzej
"Najprędzej" means "the fastest" or "as soon as possible."
In this context, 'najprędzej' emphasizes immediacy and urgency for the action of starting to exercise.
Musisz zacząć ćwiczyć najprędzej, jak to możliwe.
You must start exercising as soon as possible.
Here, 'najprędzej' conveys the likelihood or possibility of the specified event—the vacation happening.
Najprędzej pojedziemy na wakacje w przyszłym roku.
We will most likely go on vacation next year.
In this usage, 'najprędzej' highlights the promptness of response in explaining the problem.