Thanks Ken for all of this. I have only just got round to reading the thread and will have a look at the links when I have more time.
I suffer from periods of TATT (tired all the time) and I know that being active helps but sometimes I just can't be bothered. But now I will be bothered - when I finish writting this I'm going to get my hula hoop out of the bedroom and put it in the lounge. I can't hula hoop but I will learn now while watching TV.
My fitbit tells me that on the days I work I easily do my 10,000 steps, sometimes nearer 16,000. I am fortunate enough to be able to walk to work, home for lunch, back to work and then back home at tea time. The problem comes when I'm not working like today - 3:20pm, 3229 steps and my housework is nearly done!
I know I can improve my activity levels but how on earth do I improve my motivational levels.
BTW, I'll stick to dinghy sailing - I do have to stand up when I have to tack, ie. turn round.