Interesting study performed a decade ago on the importance of hydration to GH release. Sometimes, it's the obvious that gets over-looked....
https://www.eje-online.org/content/145/4/445.full.pdf
Pretty significant, IMO. Now combine that with 3g of Gamma GH prior to training. That's been shown to boost biologically active GH almost 5x's normal...
https://www.ncbi.nlm.nih.gov/pubmed/18091016
And this was in men in their twenties!!!