Nicolas Vullioud managed to really shrink his waist. Patrick Tuor discussed it on one of Fouad's podcasts. It wasn't an easy process. Took over a year, he stopped working out and got off gear. (I'm sure he trained here and there but nothing intense). Worked on vacuums, and basically let his muscles athrophy. I think you can really tell a difference.
Here he is currently:
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And here is on the Olympia stage in 2018:
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