This is probably going too much OT, but I'll tell it anyway. When riding a fatbike, I usually try to stay on trails and to avoid roads as long as I can. Usually that means not making some reasonable circle ride, but going randomly around the forest. Often it leads to a situation where I have chosen to ride a trail which fades away or just disappears suddenly. Then I still try to keep going even if there is no trail at all. Sometimes it goes just nicely and I manage to find another trail to follow, but often I end up walking and carrying my bike instead of riding it This kind of biking is a quite heavy exercise. My average speed is usually around 10km/h or even less, but average heart rate is still more than 150bpm