Microsoft Band 2 update allows users to track their heart rate zones for aerobic exercise
For aerobic exercising, it is recommended that your heart rate be between 65% and 85% of the maximum rate. With the new feature, you'll be able to see at a glance if you're comfortably in the right zone, or if you've exerted yourself too much. The update includes a fix for a repeat SMS bug that affects Android users with the Microsoft Band 2, and gives these same Android users access to Cortana via the wearable.
The Microsoft Band 2 works with Android, iOS and Windows 10 Mobile powered smartphones, and the update will be found in the appropriate version of the Microsoft Health app. A new Explore tile has recently been added for hikers and cyclists, and a $75 discount on the device taking the price down to $174.99 in the Microsoft Store, has been expanded to July 9th.
source: SupersiteforWindows (translated) via WindowsCentral