Article continues below advertisementDan Marino is opening up about his health - and offering reassurance to fans in the process.The NFL Hall of Famer, 64, gives a rare update on how he's managing his medical woes after revealing in September that he's been living for more than two decades with metabolic dysfunction-associated steatohepatitis (MASH), a serious liver disease many Americans don't even realize exists."I feel really good actually," Marino tells OK! during an exclusive interview. "I feel really good and continue to work out and try to be positive in life.