Tested by our CNET fitness expert and recommended by the personal trainers we consulted, these are the best chest strap heart-rate monitors for your workouts.

In 1901, building on the earlier work of Matteuci and Waller, Einthoven created the first string galvanometer and assigned letters to each specific deflection.1 This was the birth of the ECG as we ...

Upgrade your traditional watch by adding apps, data, and notifications to your wrist. Here are the features to look for, along with the best smartwatches we've tested.