1. he knows that if he starts strutting around, it'll just look hilarious because his arms and legs would be bouncing around. since he wants to maintain the mantle of civil rights leader, ali knows that decorum must be preserved. thus he chooses to remain aloof, only barely moving when in public.
2. he just gets super-tired because his arms and legs are always moving. it's super-tiring having your arms and legs moving around all day!
3 months ago