Second question

May be I am doing this all wrong. Should you be standing up to do PE or can you sit?

I do most standing, but also I sit and stretch out and down as well, I find this is very good when really soft it stretches right out.

I sit on a lowish bed if to high is not so good.

Either. I clamp sitting down but I stretch standing. Up to you really.. :)

Both, what is most handy for you. I even do some PE lying down :) .