In a street fight, it is a wise strategy to use obstacles in the environment for self-defense. Here are some tips to help you quickly find and take advantage of these obstacles: 1. **Observe your surroundings**: Quickly scan the environment where you are and look for any available obstacles or cover, such as trash cans, benches, street signs, or vehicles. 2. **Use terrain**: If there are uneven areas, such as steps or slopes, you can use the high ground on the terrain to your advantage, or change your position to get a better view and hinder the opponent's movement. 3. **Find cover**: Any solid and large enough object can be used as cover to help you avoid the opponent's attack. For example, a wall, telephone booth, or large tree can provide short-term protection. 4. **Use improvised weapons**: Check the surroundings for suitable objects that can be used to strengthen defense, such as branches, stones, bottles, or other small objects that are easy to grab. Remember that this is only a means of self-defense to prevent the situation from escalating. 5. **Stay dynamic**: Don't stay in one place for too long, keep moving, and use obstacles to deal with your opponent to maintain your flexibility and make it more difficult for the opponent to attack. 6. **Call for help and find an exit**: At the same time, try to shout to attract other people's attention, use obstacles as cover, and find a way to escape the scene is the top priority. 7. **Avoid confined spaces**: Try not to be forced into a corner or a confined space, which will limit your space for movement; use obstacles to create more escape routes. Remember, safety is the first priority, and avoiding conflict is the best strategy. If you can escape or avoid a fight in advance, it will be more effective than any physical defense method.