Floyd Mayweather Jr. says jail is killing his boxing career ... after just 12 days. The poor woman-beater can't get the training or caloric intake he needs!
Mayweather says in legal papers - in which he begs a judge to release him from jail into house arrest - that he needs to get out or he'll lose everything.
Floyd must serve only 78 more days in lockup, mind you.
He says he spends 23 hours a day in isolation for his own safety, but he claims that it's taking a "cruel and inhuman" toll on his physique ... seriously.
In the papers, Floyd, 35, estimates his career only has a few years ... his days of making excuses for not fighting Manny Pacquiao are dwindling!
Floyd's doctor told the court he's concerned about Floyd's diet - down from 3,000-4,000 calories a day to 800, supposedly - and lack of exercise.
Floyd says his doctor also "expressed deep concern for [Floyd's] health," predicting likely "irreversible damage to Mr. Mayweather's physique."
Mayweather claims doctors are deeply concerned about his "dehydrated appearance, his lack of muscle tone and his dry mucus membranes."
If only Floyd were concerned about the appearance of Josie Harris' face, he might not be in this position. Wrap your membrane around that.