The Fourth Frontier Black Friday Sale is on (Nov 28-Dec 01)! Use code THE5KRUNNER to get…
Tag: frontier x2
Garmin HRM 600 vs. Fourth Frontier X2 – A Buyer’s Decision Making Guide
Deep dive into the top-end features of the Fourth Frontier X2 (Heart Health) and Garmin HRM…
A new way to pace endurance efforts: using Ventilatory Thresholds for Running and Triathlon Training
VT-based zones offer an alternative approach to setting and monitoring zones.
Fourth Frontier X2 – Leading ECG Strap gets VO2max Feature Boost – Deep Dive
valuable features for premium subscribers.
[2025] Fourth Frontier X2 Review ❌6 Cons❌, ✔️8 Pros✔️ ECG heart rate monitor
Fourth Frontier X2 Review: 30% plus Discount & Coupon, ECG Heart Rate Strap
