Processing the images turned out to be interesting - he wanted something that wasn't "standard", something more exciting, a bit like my live music photography. I was skeptical because I worried that not everyone going to the website to check out the gym would be excited by heavily processed pictures - a certain amount of realism is called for in my view.
In order to demonstrate it I created 4 different processing forms and sent a page of 10 images in each version, giving each form a different title: