Being judged at gym prevents wife going

I started going several times a week to the gym; I find that the exercise is amazing therapy for my Parkinson's Disease tremors. Now I'd like my wife to come along as my gym buddy. She won't go. My wife is a big girl so she has body issues, she doesn't want to feel judged. The gym I go to is pretty chill, but how can I help my wife overcome her phobia?