Oooooo thats a hard one Mmmmm I know I would be mortified if BHL said even in a nice way that I should start going for a walk... I hate it even when I tell him I need to tone and he said yeah you do...

sorry not much help good luck...

but on the other hand if you just tell her then she can only be mad for a day or two and then she might just get of her butt and go for a walk with you the next time you ask her to come... But if she is anything like my BHL it will be brought up over and over again until the day you die... lol