The purpose of the grade in the walk description is to assist members to select appropriate walks for their walking capability.

The Ramblers website uses the national Ramblers grades, which range from Technical - eg extreme walking in the Highlands of Scotland, maybe using ice-axes - to Easy Access - flat walks with no stiles, suitable for prams and people in wheelchairs. Using that grading system practically all of our walks are graded "Moderate", and a few "Leisurely" or "Strenuous" (these can be longer and faster walks). 

If you are uncertain of your walking capability it is probably best to start with a shorter, lower grade of walk, then move up through the grades as your fitness improves.