TomTom's new GPS watches track your heart rate without a chest strap (update: US pricing)

Now that smartwatches have built-in heart rate monitors, it's not enough for GPS watch makers to require a chest strap for the same feature -- they've got to step up. TomTom, at least, is ready. It just revealed the Runner Cardio and Multi-Sport Cardio, both of which improve on the original Runner watch by combining position-based exercise tracking with an integrated optical heart rate sensor. The new wristwear lets you train based on intensity, ranging from low-tempo warmups to full-on sprints. If that's the kind of fitness monitoring you've been craving, you can pre-order the Runner Cardio and Multi-Sport Cardio for £250 ($416) and £280 ($466) respectively.

Update: TomTom has since given out US pricing: it'll cost $269 for the Runner Cardio, and $299 for its Multi-Sport sibling.