Can you die of too much exercise?

My school is like police/firefighter/criminal justice and forensic science high school and im going in as a freshman this year, i wanna be in criminal justice but theres ALOT of exercises. im skinny , 14 and i weigh 103 . I eat alot of unhealthy foos but now im starting o wii fit and do exercise and eat mor e healthy. I think i may have to do push ups. Can i die from alot of thosw exercises? I really wanna be in that school but idk about the exercises :/