Sennheiser doesn't often veer onto different sub-categories of headphones or earbuds, though there are exceptions, like the idea of "sports" wireless earbuds ruggedly designed to handle more active lifestyles.
The Sennheiser Momentum Sport are a second crack at this, only this time with an in-ear heart rate monitor and temperature sensor to track certain fitness metrics while wearing them. Music plus fitness tracking is usually reserved for other wearables, but this integration is an innovation that could lead to more like it down the line.
