The main safety consideration for most trekkers in the Sacred Valley is proper acclimatization and physical fitness. Pushing yourself into a trek without being fit enough or giving you enough time to get used to the altitude can be dangerous. Many of the guides speak several languages, and it is important to get a guide that can speak the language your most comfortable with in case there is an emergency. With regard to safety, the guides have the final say on all treks if they feel that something is unsafe or if the group should take a break. Respect your guide’s decision and understand that they have superior experience and knowledge of the area, and considering the safety of the group as a whole.