I can not run more than few hundreds of meters if I run as fast as when escaping a tiger. Pulse goes into "red zone" and I get exhausted. What I can escaping fr

I can not run more than few hundreds of meters if I run as fast as when escaping a tiger. Pulse goes into "red zone" and I get exhausted. What I can escaping from tiger in forest is to climb almost any tree hoping the tiger can not do it (but obviously it can).