Surveillance work

Take a walk in a crowded place eg a market. Start a conversation with a stranger. While engaging the stranger survey the surroundings and note how you can move naturally to view everything all around you without appearing like you are doing surveillance work. Make a mental note of all the objects that you can see in your surroundings such as reflecting surfaces, door ways, high fences, staircases, side lanes, pedestrian bridges and escalators, police station, bus and taxi stops, street lights and sign boards, hand railings, manholes, roadside drains and gutters, etc, etc. Repeat the drill in another crowded spot eg a shopping mall, minding all the surrounding details.

This is a solo street survival drill and survival is about not being where it is dangerous. The odds of escaping and surviving an unprovoked assault in the street are better that way and you don't have to be the meanest martial art fighter or the hardest puncher to live another day.