I have been looking into this for quit some time. And in reference to before and after bum picture above would just never happen. You can work out and diet to your hearts content but you won't achieve anything near that. no matter what you do. Trust me I have tried, and I know how to work out like mad. Someone always suggests on these treads that ,"you just need to do more squats". It helps, but not much. In reality your arse just gets harder lol. You'll get a bit of help from HRT but again nothing like what you are looking for.
So the option is BBL (Brazilian Bun Lift) where they take your own fat put it from where you don't want it and inject it wear you do want it. The only problem is you have to have enough fat to make a difference. And depending on the person, you will absorb 40% of the new repispributed fat. So if you are skinny like me, BBL isnt an effective option. Surgeons tell me they would give me bum implants and lipo me a bit and inject it into my hip area for a more hourglass figure. Bum implants aren't easy but if you do axactly what your doctor tells you, you should have no complications. I have had friends (genitic women) that have had it done without serious complications. Though it wasn't easy.