Jonny, you may be losing loads of weight but you have had several people on this forum tell you that you are doing too much exercise and it isn't good for you. So i don't think it's a very good idea to be encouraging other people to do as much as you.
To the others, i agree that you can do some exercise on SS, just don't suddenly start exercising loads if you didn't before and if you are used to doing loads already, tone it down a bit.
I've had knee problems so i've not really been exercising, but i'm hoping to start again in a week or so and see if i'm ok. I walk a lot anyway so it's not like i haven't done anything. when i start to come up the plans i want to increase my exercise at a similar rate to my food. When i'm off plan i want to be doing regular exercise for the rest of my life. It's either that or no more cake - ever!