Has anyone used a particular one that they have actually lost weight from, that they could recommend? I want to lose about a stone, but I'm seriously unfit (in my 40s) so I need to incorporate some exercise that I'm actually going to be able to manage to do. Looking at something like the Davina one, or has anyone tried Second Nature which seems to be NHS approved? I need some motivation to turn my life around, which isn't the same cost as a real life personal trainer, but as close as I can get with an app.