Amazon said the Echo Buds can track the duration of a workout, the steps you take, estimated calories burned and how fast or how far you walk or run. The feature is rolling out over the next couple of days, according to the company. CNBC hasn’t yet tested the feature but Amazon’s Halo wearable seems to be the company’s more serious approach to health monitoring. Amazon said steps are measured using an accelerometer in the Echo Buds. It also takes into account a user’s height entered into the workout profile.