Dawid Olszewski (@trener_dawid_olszewski on Instagram) is a bodybuilder and high-level coach. He’s been bodybuilding and coaching bodybuilders and lifestyle clients for over a decade and is incredibly knowledgeable on training, diet, and performance-enhancing drugs. Dawid has an excellent podcast and YouTube channel of his own where he interviews top coaches, posts daily vlogs, and goes in-depth on his diet, training, and more - most of it is in Polish, but I still get a ton out of watching it and the interviews are mostly in English.