Final answer:
Alfred decides to start boxing again because he is inspired by Muhammad Ali's passion and activism.
Step-by-step explanation:
Alfred decides to start boxing again because he is inspired by the passion and activism of Muhammad Ali. Ali retired from boxing but continued to fight for peace and justice, and he raised awareness and funds for Parkinson's disease. Alfred sees Ali as a role model and decides to follow in his footsteps, using boxing as a platform to make a difference.