Love this topic! My challenges..overweight, asthma, OA in both knees, chronic low back pain. The climbs were tough, but manageable if I went slow and I did, believe me. Used my rescue inhalers just twice on the ascents. The descents were the hardest because of my knees and my fear of slipping and falling (did I mention osteoporosis?), which didn't happen. I did what I would do going down steep ski runs..traversed and that made it easier. My favorite descent was from Cruz de Fero to Molinaseca...long, steep, remote, beautiful. I did that whole day from Rabanal to Molineseca alone and it was powerful..how can one feel exhausted yet filled with energy, strength and confidence. My most memorable day on the Camino.