Meanwhile, a new interval workout feature guides you through high-intensity exercises and rest periods - a solid feature for those interested in circuit training or personalized boot camps.

The Charge 2 and Flex 2 are stunning devices. Similar to the Alta and Blaze trackers, you can customise the look to your liking with interchangeable bands and clock faces. There's now a Cardio Fitness Level score, essentially an answer to the question not only of "how fit am I?" but "how do I compare to other people like me?"

Finally, Fitbit's app is also getting a significant overhaul. As that happens, the app will also make personal trainer style suggestions to tweak your routine, like suggesting when an extra session might be most beneficial, or giving weight advice. And the Fitbit Charge 2 does the same thing. It doesn't include a true display nor does it have a heart rate sensor but that's not surprising given its price point. Fitbit says guided breathing practice can have health benefits that include reducing stress and lowering blood pressure. My Apple Watch wants me to move for one minute of every hour, and will remind me at 50 minutes past the hour if I've been stationary up until then.

As the world's top tech companies prepare to descend on Europe's biggest tech show, Fitbit unveiled two successors to its best-selling Charge and Flex activity trackers, which can measure steps, heart rate and sleep quality. Leather bands in Pink, Brown and Indigo are available for $69.95. Two special editions - one with a lavender band with rose gold body, and the other with a black band and gunmetal body - will follow on afterwards.

Indeed, the whole tracker itself has been redesigned, and there's an extra, color LED atop the row of white progress lights. The tracker will provide notifications of incoming calls and texts via different types of vibration and light patterns. The former is 30% smaller than the original Flex, capable of receiving call and text alerts, promised to be "swim-proof", and features optional accessories from brands such as Vera Wang and Tony Burch.

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Analysts expect the refreshed product lineup will boost the company as it heads into the holiday season, partly based on Fitbit's reiterated full-year guidance. This means that if you have your phone in tow while you're doing some sort of activity that involves location tracking, like running or cycling, the Charge 2 can add Global Positioning System tracking to your workout for more accurate distances.

The Fitbit Flex 2 can be had with This Stylish silver bangle.

So, the new Fitbit Adventures are effectively individual challenges.

Although it doesn't have an optical heart rate sensor or Global Positioning System, it comes with Fitbit's Smart Track feature, allowing the low-priced wristband to auto-detect when you've started an exercise and vibrate when you've sat still for too long.

The idea is that you can match your steps in real life to the virtual trails at each location and thus aim to reach your daily goal to unlock the view from the destination. The Fitbit Flex 2 will have a new swim-proof design that's slimmer and can be more easily customized than its predecessor. Additional bands are sold for $29.95. These gold-plated accessories will set you back another $99.95, while the stainless steel bangle and pendant will cost $89.95 and $79.95 respectively.