Choosing between a chest strap and a wrist sensor
Wrist optical sensors are convenient but often lag at the start of intervals, read poorly in the cold and can lock onto running cadence, producing a smooth line at 165 that has nothing to do with your heart. A chest strap measures the electrical signal directly and is still the reference most coaches trust for zone work.
First tasks
- List the sports you train and the watch or computer you use for each
- Compare three sensors on accuracy, connection type and water use
- Read two independent accuracy reviews of your shortlisted sensor
- Buy or borrow the sensor and pair it with your main device