I am a doctor from the UK . I took the trek to Machu Pichu with Salkantay.org ,I travelled with one Brazilian and 5 Americans , We all shared concerns about our fitness and forward but overcame these anxieties . The first day was spent at high altitude Shortness of breath was the norm , Camping at night made me require to wear all my clothes (and my shoes). The second day was the longest trek. It was a thoroughly enjoyable experience and a test of your fitness. We all came through it although the Americans required horses for the climb uphill . We saw immense landscape, including that of the forest. I look forward to Machu Picchu tomorrow.