If you are running the Store App in Kiosk mode you might want to limit your members access to other apps and settings on the device or when you come back from coaching.
One way to do this is to add a child access account to the tablet. I'm not saying your members are kids, but I think you understand what I am getting at here. This technique will make it so the PushPress Store app is the only app your members will have access to on this tablet.
Instructions on that can be found here