I would like more flexibility to create invoices for clients. Currently, I use another platform to create invoices for some of my clients. Trainerize only gives the option to bill a client monthly for a main program. I have some client that do split payments and some clients that do package sessions that are not monthly payments. The other plat form that I use, gives me the flexibility to create invoices that will allow my client to make their payments. I would for that flexibility within Trainerize also.