Bo Jackson.  Bo Knows.  Bo was the ultimate athlete of his time, where the 'crosstrainer' was invented.  He was unlike anything before him therefore needed a shoe unlike anything else.  The Nike Air Trainer Max 91 was a Swiss-Army knife of its day, able to translate seamlessly in all forms of activities, from running to a stringent workout at the gym. It was made with one talented athlete in mind, Bo Jackson.