Many MMA careers come to an end when a fighter has lost multiple bouts in a row , probably .
They 're getting too old or their drive to train every day and their willingness to take punches to the head has just stopped .
Many MMA careers come to an end when a fighter has lost multiple bouts in a row , probably because they 're getting too old or their drive to train every day and their willingness to take punches to the head has just stopped .