5 Use alternative methods If you feel that the stair surface is too small, there is not enough space or the air cannot circulate, it will hinder your movement. Then, you can go to the gym to find a stair trainer or treadmill to do HIIT and slope running training.

Warm-up 10 minutes. Get on the treadmill, raise the slope, run step by step with a sprint of 30 seconds and a rest of 30 seconds, repeat for 20 minutes (you can start to challenge slowly from 5 minutes, 10 minutes, 15 minutes), and finally set aside 10 minutes for gentle running or closing the door.