Hey Anita, you've got a severe attack of the outdoor walking / hiking bug. Symtoms - great pleasure in being outside and active, even if it hurts a bit (ok a lot) at times. Side effects - fitter, happier and altogether more connected. Side effects on dogs - fitter, happier and very impressed with their humans.
Long term prognosis - terminal, the bug once caught rarely disappears and the outlook is extremely rosy. Chronic sufferers are unaffected by the weather and merely put on waterproofs / coats and continue to enjoy themselves.
Welcome to the club. I caught the bug as a kid and it keeps me sane (well, as sane as I have any intention of being!)
Enjoy the hills, Jay