This fitness wearable let me track an often overlooked metric - and it's on sale
Briefly

Recent advancements in wearable technology have allowed amateur athletes to access vital performance data through devices like smartwatches and heart rate monitors. A focal point is the Core body temperature sensor, which records internal heat levels without invasive methods, catering to both amateurs and professionals. Personal experiences highlight its importance during hot weather, with metrics indicating optimal performance levels. As athletes also start tracking running power alongside heart rate, it’s become evident that these tools play a significant role in enhancing training efficiency and understanding one's body during variable conditions.
The Core body temperature sensor adds another element to your training regime, and while it may be more important for professional athletes, it is priced where even amateur athletes can gain access to its insights.
I went on three long runs during my first week in temperatures that you'd only see at the height of summer in Washington state and was surprised to see my core temperature and heat strain index numbers increase.
Read at ZDNET
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