Coming up with an exercise plan and sticking to it is hard enough—but things get more difficult when you can't measure your progress after a workout. But with a fitness tracker like the Fitbit Ionic, you'll know how many calories you burned, the distance you traveled, and what your heart rate was for any style of workout you choose. And right now, it's 32 percent off.

In addition to heart rate and calorie counters, the Fitbit Ionic delivers all the measurables you could ever want, like your daily steps, floors climbed, crunches performed, active minutes, and stationary time. It also functions as a standard smartwatch, giving you access to notifications from calls, texts, calendar alerts, and more. You can even use your credit and debit cards through a payment function using its integrated NFC chip.

The watch's built-in GPS allows hikers to see precise pace and distance. And it's equipped to offer feedback whether you're running, cycling, or lifting weights. The watch is also water-resistant for up to 50 meters, so you won’t have to worry about sweating it out during a hard workout or a run in the rain. If you're just using the typical fitness functions, the watch provides four hours of battery life. But if you're in GPS mode, you'll receive 10 hours, so it's best to be prepared if you're going on a long trek through the woods.

The Fitbit Ionic is currently available right now for $170. Check out more information here.

Prices subject to change. If you haven't received your voucher or have a question about your order, contact the Mental Floss shop here.