PE in the shower?

Is it okay to do PE exercises in the shower? If yes, should I still use a wash cloth and use the warm water are wrap it around my penis? Or can I simple warm it from the water?

I regularly do mine in the (private) showers at the gym after my morning workout. I let the water from the shower hit me in the crotch while I shower, shave, etc, and count that as my warm up. I then start stretches after that. I keep some lube in my shower bag and will do jelqs if there isn’t a line to the shower. Works perfectly.