During the pandemic, especially with gyms shut down or just less appealing, people bought a lot of wearables. Those are smart devices that you wear on your body — in your ear, on your wrist or as a patch, even — that track your activity in some way. Look at sales of smartwatches. They jumped by almost 18% in 2020, according to Gartner. The research firm also forecasts that spending on wearables will grow to more than $81 billion by the end of this year. Marketplace’s Marielle Segarra talked to Ramon Llamas, a research director at International Data Corp., about why wearables got so popular during the pandemic.