It's uncomfortable to come back from Tieshan Mountain.

Does the subject want to ask "Why is it uncomfortable to come back from Tieshan"? Lack of exercise and physical exertion.

1, lack of exercise: climbing iron sand mountain is an aerobic exercise. People's lungs need to increase their vital capacity to drive the whole body to exercise, and all parts of the body have been exercised, so they will feel very tired and uncomfortable after coming back.

2. Physical exertion: Climbing the Iron Sand Mountain consumes energy substances such as sugar, protein and fat in the body, especially when the muscle protein is decomposed in the body, it will produce acidic by-products, so it will be uncomfortable to come back from the Iron Sand Mountain.