In this case, you can improve your running speed through training. You may just exercise too little. Spending a little time running every day can definitely improve. Running has a lot to do with your heart and lung function. Now you just don't practice cardiopulmonary function. After running for a while, your running speed will come up. What are the dangers? There is not much danger now. Besides, many dangers are unpredictable and related to luck, but one thing is that people who exercise regularly have faster reaction ability than those who don't exercise, and can avoid some unnecessary injuries.