Fattening others

I got some belly that I know will fill in but I really want a huge back side

Moderate exercise like quads and donkey kicks works. Get some muscle under a layer of fat. You have to constantly continue to do the exercises. It will give the Sumo look but much depends on your genes.

My wife got into exercising three times. What works and doesn't.

Doesn't work ... Running. She dropped down weight and was at her thinnist.

Weight training. Hipsleds, etc. Her ass got bigger...she already has a big ass.

Spin class. She got into wattage competitions. Her ass got huge.