Beyond smartphones, the two gadgets you see most often at the gym are fitness trackers and headphones. Samsung Gear IconX Earphones combine these two into a compact package. The 'phones have 4GB of internal storage, so you can play music without taking your phone with you, and built-in sensors record data like heart rate, distance, speed, and calories burned. Of course, you can also stream music to them over Bluetooth, an ambient sound mode ensures you can hear what's going on around you when you're running on/near the road, and the included carrying case doubles as a charger, giving you two extra top-offs before you need to find an outlet.
Our ears all look different. Turns out they hear differently, too. Nura Headphones are the first cans to take this into account. Using a microphone to measure both the tones going in and coming out of your ear canal, they adjust the sound automatically to match your hearing. Helping things along is a novel design that uses an in-ear driver to handle highs, and an over-ear cup with a bass driver, letting each note and tone breathe while also doubling up on noise isolation. They're powered by a digital connection to your device, so there's no battery to keep charged, and since the sound is custom tailored, you can leave the volume lower and save your hearing at the same time.