You don't need a product/app to live a healthy lifestyle
You don't if you live within constraints which are healthy. Many people do not, because of their job, or because of the way their physical environment is set up - for instance, you may stand in a shop for 8 hours a day, and develop problems with your legs. The sensible thing to do is not to stand for 8 hours a day, but the reason why you may have done that before is because that is the expected, default behaviour. To change that so you are moving around enough not to cause damage requires deliberate and ongoing intervention, and something that tracks movement can certainly help with that. Likewise if you develop health problems from sitting for 8 hours a day.
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You don't if you live within constraints which are healthy. Many people do not, because of their job, or because of the way their physical environment is set up - for instance, you may stand in a shop for 8 hours a day, and develop problems with your legs. The sensible thing to do is not to stand for 8 hours a day, but the reason why you may have done that before is because that is the expected, default behaviour. To change that so you are moving around enough not to cause damage requires deliberate and ongoing intervention, and something that tracks movement can certainly help with that. Likewise if you develop health problems from sitting for 8 hours a day.