Fitbit's new Alta HR is the smallest fitness tracker to include a heart rate sensor
Fitbit Luxe review: A tiny tracker that's both easy and hard on the eyes | Engadget
The best low-cost fitness trackers to buy in 2021 -
Amazon.com: Motiv Ring Fitness, Sleep and Heart Rate Tracker for iPhone and Android - Waterproof Activity and HR Monitor - Calorie and Step Counter - Pedometer. Ring Sizing Set and Redemption Kit
Best Buy: Amazfit Equator Activity and Sleep Tracker Black A1501-B
Fitbit Luxe Review: Smallest Tracker Aims For Style And Substance
The $99 Up2 is Jawbone's smallest and cheapest fitness band - The Verge
This Ultrahuman 'metabolism-tracking' ring may be the smallest consumer health and fitness wearable - Yanko Design
10 Best Fitness Trackers for Small Wrists (2022 Updated)