Women can compete on an equal footing with men on walking long distances. So says the ultra-marathoner Scott Jurek "The gender gap diminishes and disappears over distance. When you’re traveling over 2,000 miles, it doesn’t matter if you are male or female. Superhuman powers are superhuman powers; they know no gender, no age."
Just ask the current record holder for best time ever for unassisted hike of the entire Appalachian Trail, Heather Anderson. 60 Days. Averaging 44 miles per day! Is Endurance Genderless?