Don't worry Jahy-sama. She'll probably gain all that weight back in a month or so so you'll be able to start again! Though in the meantime, keep it up! Defeat that magical girl with pure strength alone!
I was thinking that, but then I thought that I might be the same. I hate exercise and when my motivation evaporates, I need a push.
IMO, it was Jahy's turn to push the boss. She could perhaps, say that she'd put the weight back on if she didn't keep it up, or guilt the boss into it.
She's been wearing them for a long time. Sort of, they're too big for her midget form to properly wear them and she doesn't use them in the normal form.