Does any forum member know if there are any gyms in the Udon Thani to Loei area?, with the usual gear tread mills, cycles machines, weights etc................

Try working in the rice fields. Would be good enough.

good idea but the rice season has finished where we are? nice try!

There is a nice gym at the Ban Chiang Hotel in Udon Thani. I stay there often and always go to that gym. Not sure how much they will charge you for the day if you are not staying there.