THE DIFFERENT LEVELS
1 : easy : No physical difficulties. The route, or most of the route, is easy to walk along with no particular, or very few, obstacles. Even, flat walking surface. Minor injuries possible.
2: quite easy : A walk or short hike. Few obstacles and none exceeding ankle height. Low risk of accident resulting in minor injuries.
3: slightly difficult : Some moderate exertion required. At least one obstacle below knee height. Relatively low risk but possible risk along certain sections of the route.
4: fairly difficult : Some sustained physical effort required. Uneven terrain requiring use of poles, obstacle that may be up to hip height. Fairly high risk of injury or serious accident.
5: difficult : Involves sustained physical exertion. Obstacles higher than hip level, you may need to use hands in certain sections, the use of poles may hinder progress. Some sections may be secured. Very rugged terrain. Maximum risk of accident.~~If you want to find out more about the grading system and use it to help organise your hikes, the French Hiking Federation has produced a guide that is available to download.