When you mentioned … " just a light jog … etc…", that can have a meaning that can be interpreted in many ways.
In the coaching circles of athletics, there is a method of preparing athletes called . Sometimes, this can be misinterpreted as just a “jog” to those that are not familiar with the system(s). Not that I’m implying what you witnessed is any less in your eyes as “just a jog.”
During the end of my career as a pitching coach, I attended a preview of this kind of “prep”, and to many in attendance, it was a departure from what I had been accustomed to. In fact many who attended, like myself, were well into our late 50’s, and thought … gimmick, gimmick, gimmick. But not any more. Going one step further, any pitching coach who really wants to see who’s prepared for a days pay and who’s not, let the dynamic stretching routines do it’s thing and watch who starts to slack off - bingo … that individual is a prime candidate for an injury(s), or has issues worth addressing on the spot.