Why 2017 is Fitbit's year of machine learning - The Signal

Around the time Raj Bhan injured himself, he decided to part ways with the data team at Netflix. He'd been training for a half marathon and plucked a regimen from the web. Unfortunately, he had grouped himself into the wrong bucket and hurt his leg. "That struck a chord," he says. "People can suffer adverse effects from being in the wrong program at the wrong time. Fitness programs really need to be personalized."