Compared with their grandparents, people today walk less, sit more and carry more weight. This essay will identify the main causes of declining fitness and then propose measures to reverse it.
The fundamental cause is that movement has been engineered out of daily life. Earlier generations farmed, walked and did physical housework; their descendants sit at desks, drive rather than walk, and relax in front of screens, so the ordinary day burns a fraction of the energy it once did. The second cause is dietary. Cheap, aggressively marketed processed food — dense in sugar, salt and fat — has displaced home cooking, so people consume more calories precisely as they burn fewer. Together these changes make poor fitness the default outcome of a normal modern life.
Solutions must therefore rebuild activity and improve diet by design rather than by willpower. Governments can reshape environments so that movement happens naturally: safe cycle lanes and pavements, affordable public sports facilities, daily physical education that schools cannot cut, and employers rewarded for offering exercise time. Cities such as Copenhagen, built around the bicycle, show that when the active choice is the easy choice, populations use it. On the dietary side, the tools are taxation and information: levies on sugary drinks — which measurably cut consumption in every country that tried them — clear front-of-pack labelling, restrictions on junk-food advertising to children, and subsidies that make fresh food cheaper than junk.
In conclusion, people are less fit because modern life has removed exercise and saturated diets with processed calories. The remedy is to redesign that life — cities that make people move and food policy that favours health — so fitness stops being an achievement and becomes, once again, a habit.