From here

Mel's secret? A change of clothes, some fake tan, an Instagram filter and some gut sucking. Here is her explanation:

"Firstly I ditched the phonewallet cause that s**t is lame, swapped my bather bottoms to blacks (cause they're a size bigger and black is slimming), smothered on some fake tan, clipped in my hair extensions, stood up a bit taller, sucked in my guts, popped my hip, threw in a skinny arm, stood a bit wider, pulled my shoulders back and added a bit of a cheeky I'm so proud of my results smile. Zoomed in on the before pic - zoomed out on the after and added a filter."

That's it. No secret weight loss formula. Not even any exercise.