CORE 2

CORE 2 is a training instrument for people who already know why they want temperature feedback. It estimates core temperature from thermal energy transfer and skin temperature while attached to a compatible body-worn strap. That creates a different view of an exercise session from pace and heart rate alone, particularly when heat changes how hard the same workload feels.

The important word is estimated. A convenient external sensor is not the same measurement as an internal thermometer, and a dramatic graph is not a reason to push through symptoms. Its appeal is the ability to observe trends in a planned training context and compare sessions using the same setup. Strap fit, placement and the supported display workflow should be checked before buying.

A cyclist who already watches heart rate on a head unit has a different setup problem from a runner relying on a wrist display. Confirm how the temperature field reaches that screen and whether it is readable during training, not just after synchronisation.

[1] CORE 2 Thermal Sensor [2] CORE 2 manufacturer image provenance