https://keenfit.com/regular-versus-pole-walking/
This diagram says it all &
I think the question should instead be . . .
“Why would you want to walk without Poles?”
Especially since adding Walking Poles engages nearly double the muscles!
And by increasing the use of all those extra muscles you more than double your benefits:
Burn up to 48% more Calories
Improve Cardio Fitness by 22%
Lighten Lower Joint Impact 26%
Align & Strengthen Core
Build Upper Body Muscles