I am a big believer in full deadlifts. For back thickness, I like BW pullups, T Bar rows, and full deadlifts. On back day I also do either DB or BB rows and Shrugs. I think there is a large-muscle synergy when doing full deadlifts as the larger leg muscles are invo9lved.
Having said this, my opinion is just based on a gut feeling. I have absolutely no evidence other than anecdotal experience to back it up.
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