Easy Gentle walking open to all with moderate level of fitness. Usually day hikes from a base with little or no camping involved. Ideal for families. Moderate 5-6 hours of hiking per day over non-technical mountainous terrain. May include several consecutive days of camping. Moderate/Strenuous 5-8 hours hiking per day with occasional days up to 12 hours, over non-technical mountainous terrain, often at high altitude. Good physical fitness required. Strenuous Long days hiking 6-9 hours per day over tough terrain sometimes using specialised equipment (eg crampons), at high altitudes. For experienced walkers. Extreme Special departures over difficult and sometimes untried routes. Often no mule support and several days wilderness camping in difficult conditions.