1= Anyone who can walk for 30 minutes continuously, including children old enough to walk. No carrying of gear is required.

2= Persons fit enough to walk, bike, or paddle for four hours continuously and may have to carry or drag a boat or bike up or down a slippery bank. Can opt out of some activities.

3 = Persons fit enough to walk, bike or paddle for four to eight hours or more in a day and may have to carry a boat overhead (with a partner) for 100 yards.

4 = Persons fit enough to walk, bike, or paddle for multiple consecutive days and may have to carry a backpack or carry a boat on a portage (with a partner) for 1/4 mile or more.
Most High Adventure Outfitters

Challenge Rating System
"a mind that is stretched by a new experience can never return
to its original dimensions". Oliver Holmes
Most High Adventure Outfitters - Indiana