Really sorry to hear it was not a success, but learn from this - Is it worth making your marketing more health and fitness based?
Along the lines of...
'After the gym what about a relaxing massage to ease aching muscles?'
'For busy and active people, my nails last longer and are stronger'
'Muscles look better with a spray tan and/or waxed'
Maybe listen to some of the feedback and go for health bars etc at next event.
Have you offered the staff at gym an incentive to recommend you?
It's always hard at the start, try not to get disillusioned and keep on going, you only need a good client or two who will recommend a few more and you will be up and running.
I will look at those options and come up with something later... Just popped on to read this all out over the phone to my mum lol