Leave an impact

So I watched Batman begins again and I'm so inspired by the Bruce Wayne character. He lived his life man, helped people, fought and left a legacy. I too wanna do something similar but realistic. If batman was real he would get shot or be caught within a year so easily. But let's not talk about that. What I mean by that is leaving a legacy and not just me all of you too if you get inspired to do the same. What should we do any ideas ?

PS - I love martial arts too like Bruce Wayne.