Warm up and pumping

Can I do warm up for 5 min before pumping? Is this activity helps in extra gains?

I personally do not warm up prior to pumping. I start pumping at low vacuum and slowly build up to 5 hg. I use this procedure as my warm up. Sometimes I “pulse pump” (5 minutes at 4 hg followed by 1 minute at 2 hg and repeat several times) as a warm up.

Yeah I don’t warm up prior to pe either. I just wrap my tube with a heating pad and slowly pump to the desired pressure. So for me it’s about ten minutes of slow pumping to 5hg, then ten minutes maintaining that 5.5-5hg. I found this also helps prevent red spots as well as a stronger erection throughout my jelqing routine.