The path may certainly be used for walking!
It begins behind building 55 and follows the canal to the DD parking area and DI.
Origially there were exercise stations positioned along the route, but those were removed long ago.
It's about a 15 minute walk to Cirque at a brisk pace, but you can walk all the way to DD/Marketplace, thru DI and back in about an hour.
The walkway is not completely lighted, so I wouldn't advise traversing the area in the dark, but it's a great early morning exercise- or anytime when the temps are cooler!
Enjoy!