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9 Fitness Trackers for All Your Fitness Needs

2. Armour39


This is actually the first tracker I used when I started logging my sessions. It’s a chest strap-based monitor, so I only use it for training. UnderArmour recommends getting the chest strap’s sensors wet before wearing; I found that once I was a little sweaty, the sensors had a better connection. Pro tip: I’ve also seen a few people at my gym use their saliva instead of water, as it tranmits an electrical signal better. Gross? Yeah, but you’re about to sweat all over it, right?

To start using Armour39 ($149.99), you click the sensor module into the chest strap, then connect it via the app. The first time you connect the device, it will prompt you to take a 10-minute assessment. It’s good to estable a baseline: then you can go back each month and reassess to compare your results. Once you’ve done the assessment, you can move on to your usual routine. I like that Armour39 tracks heart rate and uses that to calculate intensity — a lot of trackers are distance-based, and since I do a lot of strength training, most of my work can’t be measured in miles. I do like to bike or walk on recovery days, though, so it’s convenient that Armour39 works with MapMyFitness. The pairing of the module and the app felt pretty seamless.

Unique to Armour39 is a metric called “willpower.” This score is a measure of the effort you put into your workout. Your willpower is measured on a scale from 0 to 10, and you can choose to set a target willpower for any session. I’m pretty motivated and competitive (even/especially with myself), so I found it fun to set and try to achieve a target. However, I’d like to know a little bit more about how exactly willpower is calculated.

Armour39 is great for seeing which programs (or even which individual moves within a day’s session) really kick up my heart rate. I like seeing that number spike, and it’s good to see how quickly I recover, too. The module uses Bluetooth, and it can store data to be uploaded to your phone when you’re out of range. It doesn’t track every little stat, but what it does track, it tracks well.

One last thing to keep in mind — Armour39 doesn’t charge via USB or cradle the way some other trackers do — it uses a small CR2032 3V lithium battery, like a watch. The battery life is supposed to be about nine months; I did have a little trouble when my module’s battery died only a few weeks out of the package. However, after a quick chat with the customer service team, a new battery was on its way to me in record time.

FTC disclosure: We often receive products from companies to review. All thoughts and opinions are always entirely our own. Unless otherwise stated, we have received no compensation for our review and the content is purely editorial. Affiliate links may be included. If you purchase something through one of those links we may receive a small commission. Thanks for your support!


  1. Stephanie says:

    Wow, thanks so much for the extensive review! I currently have the polar loop – original – and absolutely love it. I use the heart rate monitor strap when I am exercising. It is my personal coach for sure! It pushes me to meet and then exceed my goal daily!

    Thanks again for the review, I love keeping up to date with the latest!

  2. Great information and I’m definitely looking into that Twister Tracker. 😀 I think my husband and I could really have a blast with that thing. 😀

    As for the tracker I use, it’s definitely Fitbit One. I love my fit bit since it tracks my steps, stairs, miles and hours of sleep. Some of these look amazing though, so I might look into something else…however I find if I have something that tracks too many things I get overwhelmed and stop using it all together. LOL. It’s definitely a less is more mentality for me. 🙂

  3. Anne says:

    Thanks for the product review. It is always such a difficult decision for me to buy a product that there are so many variants of. I tried looking for products that have complementary things I’m looking for. I was struggling with sleep and needed a new pillow. While looking into that I found a company that sold both a sleep/activity tracker and a pillow that I heard was amazing. I got the 100series tracker and an adjustable pillow. https://rem-fit.com/ Both have worked so great for me. Good luck on your choices!

  4. Amanda says:

    Love these! Seriously, I may have an addiction to fitness trackers of all sorts haha! One that would rock on this list too is the ncredible sleep tracker, The REM-Fit Sleep Monitor. It’s an incredibly thin strap that lays across your bed, and while you sleep it monitors your heart rate, respiratory rate and motion. It analyzes all of the data from your sleep to give you a sleep score based on how long you slept, your heart rate, respiratory rate, motion and more. Then, you just tap on your sleep score in the free app and you can get a full account of the factors that make up your score. Plus it has an extra long lasting battery so you don’t have to plug it in each night. Just charge it up while you wash your sheets and you are all set. I highly recommend this. You can see more info about it at this link: Fitness & Sleep Trackers (https://rem-fit.com/) (Seriously the best sleep tracker I’ve found.) Huzzah to fitness tracking devices!

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