Buy Kinetik Heart Rate Monitor Watch at Argos.co.uk - Your Online Shop for Heart rate monitors. I've got one of these HRM so a cheapy option. I set it up correctly and strapped my chest belt on correctly etc etc. Did 50 mins of intense Body Combat with my heart rate averaging around 175-190 for the duration. I pressed start at the start of class and stopped just before the cool down. When I clicked the calories option it said I had burnt 40Kcals....40!!! Eh?!! In bigger font it had 607 in big letters, but no kcals after it so what do we think? 40 seems a bit low but it had the "kcals" written after it or do you think it was just the symbol to indicate that I was on the kcal option?! I don't know what to think. 40Kcals burnt for 50mins damn hard work.