Polar (Running) index - Based on heart rate and speed data measurement during the run.It gives daily information about the runner’s performance level, both aerobic fitness and running economy. Improvement in running efficiency indicates improved economy of running performance.* 31-37 poor, 38-44 fair, 45-51 average, 52-58 good, 59-65 very good, >65 excellent
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aga maratonist võiksid ka siiski pikemalt kirjutada...
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