Walking paths are 3 to 8' wide, and so are not designed for cyclists to use (though some do!). They are always constructed with a hard (paved or gravel), stable, and even surface (otherwise these would be considered trails). Walkers can always use Shared Use Paths, but must just expect to encounter cyclists.
Some other things to note:
Walking Paths usually meet accessibility standards for surface, width, obstacles, and so on, and so would be rated as low stress. Some may not meet accessibility standards for grade because of sections with steep running grades (and sometimes cross grades), and the lack of resting spaces.
Strategies for building your capacity (planning your outing, finding your comfort zone, establishing a routine, and then reviewing progress) are similar whether you are walking a path, hiking a trail, or cycling on a route.