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Nude exercise class poses for monthly group photos to follow their weight loss and toning progress.  Meeting for the class on the nude beach when weather allows provides the open air environment.
Personal trainers put you through the paces training you nude.
The freedom of running naked.
Strict personal trainer.
Nude exercise at the farm is not always an option girls can refuse to do.
Exercise on time or else. One of the conditions of being accepted into advanced sports competition training schools is to accept corporal punishment.  For anyone of a number of a list of reasons  Foremost of which is to never miss a scheduled training
