This wearable improved my fitness performance by tracking an often-overlooked metric

- For $285, the Core body sensor is currently on sale.

- It is lightweight, has a long battery life, measures internal body temperature accurately, and has a useful smartphone app.

- The device requires an adhesive patch or chest strap to be attached, and it is quite costly.

- Over the past ten years, wearable technology has improved to the point where amateur athletes

- can now record large amounts of data with their smartwatches, GPS sports watches, and external heart rate monitors.

-  I've been using the Core sensor, a wearable gadget that takes your internal body temperature without the need for more intrusive techniques, for the past few months while I run and cycle.

- Running power has gained more attention in recent years, but heart rate tracking has always been the most popular performance indicator for runners.

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