Not only the legs and arms, but also the waist and abdomen will participate in the consumption of calories.
So running will make all three of them lose weight.
And mountaineering is more about legs, which will make your leg muscles more developed.
Mountaineering is the least effective exercise to lose weight.
Running is also a good choice to lose weight, but running can only exercise legs and arms.
The weight loss effect on other parts is not particularly obvious.
Hope to adopt