There is a park I go to regularly for a walk - at least once a week. It consists of a number of different trails that combine together to make a decent length loop back to the parking lot. But what is a mystery to me is that if I do the loop clockwise, I feel like there are more uphill sections and I am pretty tired by the time I get back to the car. But if I do the loop anticlockwise (or as the Americans prefer to say, counter-clockwise) then the hike seems a lot easier and I feel like I have loads of energy by the time I'm finished and that I could probably go on for a few more miles. This shouldn't happen - there shouldn't be any difference in elevation change. Very strange - it's not like the uphill sections all occur at one end of the loop, or that there are any significant differences in gradient depending on which direction you go. Whatever.
