why is going up the stairs (or up a hill) so much more physically intensive?

Question

I am not very fit, but I do walk a lot. However when I go up 3 flights of stairs I am out of breath. How come?

In: 0

Answer 1

You are climbing against a “grade” or angled surface. Add the steps and now you got means to go against the grade but with mechanical effort and ability you just got a nice little workout.