Joggers naturally pace themselves to conserve energy even on short runs
Data from fitness trackers and treadmill tests challenge ideas about what drives speed
![a woman running along a rocky shore, with a phone strapped to her arm](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2022/04/042722_ch_running-energy_feat.jpg?fit=1030%2C580&ssl=1)
Recreational runners tend to pace themselves at a personally optimal speed for both long and short runs, which minimizes the amount of calories burned over a given distance.
MOHAMMAD MOHAMMAD