The Jefferson squat has the potential to be beneficial for anyone - whether you should use it or not depends mainly on whether you are willing to put the time and effort into practicing the form and technique required (which is likely to take longer than usual due to the unnatural nature of the position). The Jefferson squat will be particularly useful for those training for more unconventional lifts such as those in Strongman competitions. It can also be used as an alternative to the standard weighted squat, as it does not place as much strain on the back.