keeping your penis warm during stretching?

So I noticed that after warmup (usually a shower) my penis gets relaxed and expands.
what I also noticed that after the warmup when I do stretches the penis cools off and shrinks, and that makes it hard to do stretches.
so my question is how do you keep it warm during stretching ?

what I thought of is either being in the shower and stretching there and when I feel that it's getting cold just turn the shower on again and warm up (but that would use a lot of water I guess)

another option I though of is using a hot towel (but this isn't as good as a shower) and keeping it in hot water so I could warm my penis up again when needed.

any other opinions on this ?

You could try doing it next to a heater. You could wrap something around the shaft, hot towel like you said or rice sock etc.
A lot of guys use IR lamps, something I'm looking into myself.

I use three stages of warming up through stretching. First the cup of warm-water for 5 to 10 minutes, rice sock for 15 minutes and stretch by a heater. So far It's been working extremely well! Have been using this for months and gained accordingly.

Heat seems to be a winner. I know when I was using a heating pad after pe I was making my best length gains.

I've used a heat lamp while pumping in the past, just make sure you don't get the lamp too close or it'll be your cooked sausage at lunchtime in the cafeteria...

I am picking up one of the sun simulation lamps this week. It is supposed to help big time with depression and other change of season issues. I will also try to use it during exercise.