Mesi is a huge liability to the sport in the old 'First World', he has been told not to fight, period.

Holyfield thankfully is only making himself a bit of joke; by continuing he is not hugely damaging his health. Although of course any 40+ year old man in the ring, way past his best, is certainly not helping his general health, and Holyfield is showing signs physically, of a very hard career.

Jones is not helping himself by continuing. His alleged substance abuses, or whatever got him up to 200lbs of muscle, have ruined his physical talents.