Article continues below advertisementBrett Favre's Parinkson's battle is worsening - but he isn't going down without a fight.Even though the NFL Hall of Famer's disease has "progressed a little faster," he is staying strong through exercise and seeking out clinical trials.Last year, he biked 6,200 miles despite his medical woes.Article continues below advertisementSource: @brettfavre/InstagramBrett Favre has Parkinson's disease."That's all I can do. No way in h--- am I giving up," the retired quarterback, 56, expressed in a Thursday, January 22, interview.