I'm confused! Which measurement is important?
Is it the aerobic factor? Some research uses perameters of heart rate as a guide. They talk of maintaining 60%-80% of your resting heart rate (calculating rhr as 220-age)
Is it the speed of movement? The bikers tell us to do 85 revolutions per minute .
Then, is it important that this movement be exactly repeated in a guided fashion as in biking? Or should it be on uneven terrain to challenge us, as in outdoor fast walking?