| 5:00 PM-6:00 PM | BBC two |
| Freitag | 5/10/2024 |
With around a third of the population now owning fitness trackers, Britain has become a nation obsessed with tracking its every move. Hannah Fry finds out how 1970s car crashes helped us to count our steps, why high-altitude WWII dogfights led to a crucial health monitor and how fitness trackers are even being used to catch killers.
