1. An easy walk on pavement or well-maintained trail with no significant hills. Probably suitable for wheelchairs and strollers.

2. A moderately easy walk, may be on pavement or on trails. No significant difficulty with hills. May not be suitable for wheelchairs and strollers.

3. A moderate walk in any setting with some difficult terrain, one or two substantial hills and/or steps. Strollers and wheelchairs questionable.

4. A more difficult walk. Most likely in a natural setting with poorly maintained paths and steeper or hilly inclines. Not likely to be wheelchair or stroller accessible. Participants with certain health problems should take caution.

5. A very difficult walk. All in rough fields or woods. Many steep hills or high altitude trails, or very rough uneven terrain, steep or unstable inclines. Not suitable for any person who is not in good health.