system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: On the treadmill at my gym, the calories per hour estimate jumps from 353 at 4.4 mph to 647 at 4.5 mph (roughly the border between a brisk walk and a light jog), and anecdotally I've noticed that a slow jog is much harder than a fast walk even if the difference in actual speed is small. Why?
gpt
Jogging slowly is a very inefficient way of transporting yourself compared to walking. Let's say that "walking fast" and "jogging very slowly" give you the same speed. When walking fast almost all your movement contributes towards transporting you in the walking direction. When you jog very slowly, you will notice that just spend a lot of energy moving yourself up and down, and less energy moving yourself towards the direction you are running.