Change does not always happen right away.  For me it took a couple of weeks just contemplating these new Short- Duration High Intensity Interval Workouts, to then implementing a few concepts into my gym workouts.

It had been drilled into me that to be effective a traditional workout could only be done a certain way.  This new approach challenged everything I had studied and what had worked for me in the past.  Or rather, what I believed had worked.

I then started substituting a home workout for a gym workout, until all my workouts were done at home.  The elapsed time for this transition took about eight weeks.  It is amazing to me the amount of time I have saved.  And the results I have gained.

Note: Short-duration High Intensity Interval Training (HIIT) and Tabatas are completely different from 4 Minute Mornings.