20 aug 2025 wednesday i did a 10k fast walk – did it in 2 splits of 4km and 6km. see my heart rate – remains a constant 110-114 bmp thruout the walk which wud be at a speed of 6.2-6.3 kmph. the 4km was done in 38 mins, 258 cals burnt therein. Next split – the 6km one – heart rate even there was constant 112-115 bpm. 386 calories. this 10km walk therefore costed 660 calories approx, only aerobic exercise, 0 anerobic. but this was a very light exercise for me – same stride, same speed