6mR other R classes are rarely refered as a ‘real’ sport. Here is some facts from TOPP 6mR tactician/main trimmer. Measured with Polar RS300X based on my personal info verifyed by Vuokatti sports academy.

4 day regatta is total of 13866 Kilo Calories! It more that I did last winter at Vuokatti when crosscountry skiining 96 Kilometers in 7 days.