Moderate versus vigorous is probably best guaged by your heart rate. 50-70% of your maximum heart rate is moderate, 70-90%is vigorous. (And your maximum is given by 220 minus your age).
Unlike walking or running, where distance covered is the major factor in calories burned, when it comes to rowing, speed matters, so distance covered is not enough to estimate calories burned.
Does the erg display any other outputs?
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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