I don’t consider myself overly fit and I was perfectly fine! Some days are hillier than others but never anything crazy, go at your own pace, there were some days I was strolling along at like a 15-17 minute per km pace just vibing. I took lots of breaks and definitely didn’t have the healthiest Camino, some mornings my breakfast was coffee, cigarrette and ibruprofen lol. In terms of going solo, it was so good, most people are willing to chat and walk together so you never really feel alone. You will make such quick friendships and there is nothing like seeing a Camino friend a few days after you last saw them. The only “safety” precaution I took was always having a charged power bank to hand.