Same effect as holding a shopping cart handle.
It can't see the impacts from your feet.
You can take it off wrist and put on body - that's what many do when shopping for that problem.
Some devices start as on-body ones.
But you might like HR readings for walking.
In which case some find putting on ankle still gets HR reading, and at least the impact of 1 step - so steps and distance and calories will be wrong, but you got HR.
Best Answer
Best AnswerI need to correct part of my comment - if it really can read the HR - then the device will use HR-based calorie burn.
So the fact you may get half the steps and half the distance seen doesn't mean you'll get half the calories.