As an active endurance athlete, you want to improve your performance between training routines by planning, monitoring and analysing your training.

Do all this and much more with the Polar RS400 Heart Rate Monitor, the complete system for runners.

The RS400 has one of the largest displays in the industry and a fully user-configurable exercise view with countless combinations. The impressive design and comfortable wrist top mounting make it a pleasure to wear also in everyday life.

• Polar sport zones - Helps you to train at the right intensity. Polar sport zones provides an easy way to select and monitor the intensity of your training and to follow Polar’s sport zones based training programmes. The training is divided into five zones based on percentages of your maximum heart rate: very light (50-60% HRmax), light (60-70% HRmax), moderate (70-80% HRmax), hard (80-90% HRmax) and maximum (90-100% HRmax).
• Interval trainer (HR, pace, distance) guided workouts - Create your personal multizone workouts with heart rate/speed/distance and timing guidance. Allows you to create and name your own favourite workouts based on time, heart rate, speed/pace (requires optional Polar S1 foot pod or Polar S3 stride sensor) or distance (requires optional Polar S1 foot pod or Polar S3 stride sensor) guidance with up to three linked timers or distances and up to three target zones.
• Event Countdown Timer - Set your goal and stay motivated. Keeps your motivation high by showing how many days are left before your next running event (e.g. Berlin 23 days).