FT is a buzzword that everyone uses, but few understand. Fun ction can easily be defined as a normal or characteristic action of anything - a duty, utility or purpose .
Function is what works.
Therefore, FT would train the body, or body area, for the movement it is intended for, or exercise that trains a normal or characteristic action. FT is not a new concept. It has been around since the beginning of time. If one wants to get better and stronger at an activity, one would instinctively rehearse the activity, or at least parts of that activity. Although this is an oversimplification of the concept of functional training, it is its essence.