Well earlier on today ( Sat ) I decide it was a good idea to walk along the canal from the Trailboat Festival to mums ( approx 5 miles ) after walking about a mile from where I was dropped off to the festival site and then spending about 1.5 hours walking around it.
By halfway I wasn't out of breath or feeling tired so I thought I wasn't doing bad given how unfit I am.
Unfortunately my right knee then decided it had done enough bending and decided to go on strike.
Bet I've got some aches in the morning! :-))