It will run fairly easily on a M series mac. People have gotten an emulator for Android to work on PC but that seems like it would requires some pretty solid technical understanding. So other than M1 mac and newer device I have no good suggestions. I would guess a used Android tablet could be found for 100$ (something that runs Android 13 is best) or something but I realize that makes TrainerDay not as affordable unless you have another reason to own a tablet like this.
I have it running on my current Android phone so can carry on as I am just now. Was hoping that I could repurpose a now redundant phone, but sadly not.