Is mountain climbing cardio?

In climbing, uptake of oxygen is not difficult, it is the delivery of fuel to the muscles, and the mechanical difficulty of breathing with most of your muscles contracted while trying to hold onto the wall. Climbing is not a cyclic steady-state activity. Climbing is an acyclic anaerobic-aerobic activity .

Aerobic: Yes . Climbing can push your heart rate to between 120 and 180 beats per minute.

Mountain Climbers are a great combination of strength training, cardio as well as core strength ! It helps to build your upper body strength, increases your core strength and is great for your heart.