Thanks everyone for your input. I don't have thyroid issues as yet but its prevalent in my immediate maternal family i.e my mum, my gran, both my maternal aunts, my gran's sister, her daughter.....I think its probably in the post!

I had my thyroid levels checked about two years ago as part of some other blood tests I was having at the time (had to insist as they said I was too young but family history persuaded them) so I at least have a benchmark of where things are/were at.

Its good to know people are still continuing with good exercise levels with medication.