I had a look at the Play Store but there are a huge number of workout/female fitness/weight loss apps that have icons along those lines, plus some photo editing apps (for changing your shape for social media photos I assume). That general shape strongly suggests something like these though (female figure with band round the waist, which could indicate movement or a tape measure)
I didn't see an exact match, but notification icons are simpler than app icons themselves, and it's hard to find images of the notification icon.