The 27 year-old Tyson Fury began working alongside middleweight title holder Billy Joe Saunders earlier this week as Fury attempts to lose over 100 pounds and launch a boxing comeback.
Fury last fought in November 2015 when dethroning Wladimir Klitschko from his ten-year reign as world ruler but spiralled into depression and drugs soon after.
Posting on his Twitter account, Fury admitted wanting to be dead on several occasions, as well as apologizing to everyone for letting himself go so much and potentially throwing his career away.