I've been walking the Samaria Gorge again 15 Kms of hard, hot walking and somehow the fact of it being mostly downhill doesn't make it any easier, especially in the light of this sign.
By the end my right knee was twanging. I suspected the cure to be lashings of ice-cold beer but was unsure whether to rub it on or apply internally. Dr Son and Dr Brother-in-Law quickly advised by text that I should immediately apply internally and, if no improvement, repeat quickly until feeling no pain. That did the trick.