Viagra works the best for me pre workout. You guys might look into a peptide called pge-1. It's site injected Viagra that gives targeted muscles huge pumps. Porn stars and rich old men used to inject it in their dongers. I slin pinned 15 mcg in arms, 4 spots (2 bicep 2 tricep) and got a huge pump but I also lost definition and they looked a little wet and bloated. I found plain old oral Viagra does the trick best for pump. I might go back to site injection just for show week to catch up lagging body parts or anything I don't like the look of.