I’ve always considered myself an active person. I joined my first gym at age twelve (my mom lied and told them I was fourteen to get around the age limit––a terrible idea, but that’s another story), and spent my high school years as a ballerina dancing nearly 20 hours per week. In college I stopped dancing but focused more on the gym, then dabbled in tennis, then long-distance running in graduate school.
As an adult I settled into a comfortable routine of working at my desk or lab bench, then spending at least an hour at the gym 5-6 days per week. Most of us would not consider this a sedentary lifestyle, and indeed it is far more active than most Americans. Unfortunately, spending long stretches of time sitting throughout the day is considered sedentary and has been shown to increase metabolic risk and mortality, even in normal weight and otherwise active people. And that meant me. Scary, right?