Gym members could face higher fees for working out to original music after a court ruled that musicians have not been paid enough for the copyright of their songs.

The decision, handed down by the Copyright Tribunal today, means that fitness centres will be slugged $15 each class or $1 per attendee of each class for the use of the music.

Gyms had previously been charged 96.8 cents a class, with a cap of $2654 a year.

Fitness Australia said it was disappointed with the decision, which it said represented a 1500 per cent increase in music costs for an average-size fitness centre.

Chief executive Loretta Stace said the gym was now reviewing the decision to determine whether there were grounds for appeal.