We started by researching the armbands that show up most often in running and cycling forums, then narrowed the list to models with Bluetooth and ANT+ broadcasting, water resistance ratings, and app compatibility across iOS and Android. Price mattered, but we didn't set a ceiling; we wanted a mix of budget and premium options. That left us with 12 units, which we tested over eight months.
Testing happened where the product actually lives: on sweaty interval runs, on a bike trainer, in rowing sessions, and during HIIT classes. For accuracy, we wore each armband alongside a chest strap and compared heart rate readings at rest, during steady efforts, and through sprint intervals. For connectivity, we paired each unit to both an iPhone and an Android phone, then walked 20 feet away from the phone to see if the signal dropped. We also logged battery percentage before and after 90-minute sessions, and timed how long it took to put on and start a workout from a cold start.
Comfort got judged over full workdays and overnight sleeps, not just workouts; we noted whether the strap left marks, slipped, or needed constant readjustment. Durability meant tugging and twisting the strap after every wash, and checking the sensor housing for sweat intrusion after repeated sessions. Versatility came down to whether we could use the same armband for running, cycling, rowing, and strength work without swapping apps or re-pairing. The armbands that survived all of it — and still gave consistent readings — earned a spot in the list.
