Hrm run

Garmin Heart Rate Chest Strap Extender - 12.8" Extension Strap Fits Pro, Dual, Run, Swim, HRM-Tri. Total up to 56" Chest Strap Length

at Amazon.co.uk

COOSPO Heart Rate Monitor Chest Strap, H6 HRM Bluetooth ANT+ HR Sensor, for Run

at eBay