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We walked the CP last year from Lisbon, and the walk from Porto will be manageable for you if:
Learn how to strap your ankle if you need (you really don’t need boots for this route)
Keep your pack as light as possible
Use walking poles
The walk will promote healing!
Whilst walking the Camino Portuguese this year (Bev and my fourth) I turned 70 at Coimbra. We met another pilgrim who made the point the the health benefits of walking a camino were worth more than a year of doctors or pills. Had to agree!