In the motion, which was first reported by the Las Vegas Review-Journal, lawyers say Mayweather's personal physician, Dr. Robert Voy, visited the jail Friday and was concerned the 35-year-old fighter appeared to have lost muscle tone.
Voy estimated the boxer was consuming fewer than 800 calories a day — a drop from his usual 3,000 or 4,000 calories — and wasn't drinking enough because he isn't allowed bottled water and doesn't usually drink tap water.
Mayweather has been getting a little more than 30 minutes twice a day in a couple of barren recreation areas in the administrative segregation unit. His cell, no larger than 7-by-12 feet, has barely enough floor space for pushups and situps.
But prosecutors argued he's "deconditioning" by choice, and declining much of his food.
"He has the ability to exercise, he just chooses not to," Luzaich said. "It's jail. Where did he think he was going? The Four Seasons?"
Voy and Wright also pointed to Mayweather's declining emotional state.
"I am concerned about Floyd withdrawing, developing anger he cannot dissipate through the usual means of dedicated exercise and training," Voy wrote in an affidavit. "Boxing has been Mr. Mayweather's life since he was a young man and we need champions of this type to continue to their natural retirement and hopefully their contributions to society thereafter."