Naked Fitness Training for Men Naked Gym Sessions and Personal Training NKD Training run group exercise classes for guys of all fitness levels.
I've been to gyms in Spain, Italy and the Czech Republic and only in the US are guys so weird about being nude in a locker room. I even saw complaints on Yelp .
Hanson Fitness in New York City is offering nude fitness classes plans to hold three sessions a week: one mixed, one for men, and one for women. NKD Training in the UK has naked gym training, but it's only for dudes.