How Well Are We Working Out?

Nowadays you look around and it seems like everyone at the gym or the park is wearing the coloured band of a FitBit, FuelBand, Apple Watch, Jawbone Up or some other activity tracker on their arm. You might very well have one on as you read this. These tools work to collect huge amounts of data about our personal activity, relatively inexpensively and easily. This allows us to quantify how much we do to improve our health by taking measurements of ourselves performing activites such as running, swimming and lifting weights. However, rarely do we try to quantify how well we perform an activity.