Stretching With Foreskin, Problem?

Hi guys, new here on this site but not new to PE.

I wanted to ask something about stretching.

On the video here I see that the guy stretches his uncut penis without pulling back his foreskin. Is this right?

I have read, that when you stretch you should pull back the foreskin, because if you do not, you’ll only stretch the skin!

Anyone can give me some advices, because I an uncut and don’t know what I should do?

I’m new to PE and I’m uncut. Not sure what the experts will say but, when using an extender for example (as I am) the manufacturers says you can leave foreskin where it is or pull it back. I’ve noticed, certainly for me, pulling it back is a must. I wouldn’t get anywhere near the same stretch if I left it in place.

I don’t buy the ‘only stretching the skin’ argument no matter what way you go. Again using the extender example, if you’re clamped in properly, then extending the device ‘will’ extend the entire penis not just the skin. I’m assuming (maybe wrongly) it’s the same with manual exercises. If you’re working the penis you’re working the penis, if you see what I mean :)

Thanks cheeky chappy, for your reply!
I see what you mean and understand it.
I personally have the feeling manual stretching works much better with pulled back foreskin.
But it is just my own feeling, I can be wrong too!

I think I will test both versions alternately, so maybe I will find out differences.