At the start of middle school Mack was diagnosed with a heart murmur that got worse with age, and was advised to only play non-contact sports. He remained in town for school, and set national junior college records in the 100 meter, 200 meter, and long jump at Pasadena Junior College.
When Mack started middle school, he was diagnosed with a heart murmur that got worse as he grew older. His doctor advised him to only play non-contact sports. Despite this, Mack stayed in his hometown for school and achieved national junior college records in the 100 meter, 200 meter, and long jump at Pasadena Junior College.