Almost any exercise is like a marathon at the moment (not yet taking medication for thyroid, so I'm really hoping it'll improve when I do). Walking is like mountain climbing - my legs feel like lead, my body feels heavy, I dread hills and I also feel quite dizzy sometimes too when walking. The only thing I don't struggle with, is swimming - perhaps because of the weightlessness? I can happily do 40 lengths each time, but I probably shouldn't be doing this many seeing as the past 2 days I've been really suffering from it! The day after swimming, I'm really exhausted, to the point where I slept twice yesterday and didn't do a lot else all day. Damned if you do.... damned if you don't huh!
I gave up my running in November after 4 years - the last one of those years was hell to be honest and I just couldn't do it anymore. It was like wading through treacle every time. When it was good, I loved it. And I miss it SO much, it's like a part of me has been taken away