Travel back in time

Ever since h G Wells time machine time travel has been the topic of science fiction and has fascinated humans minds young and old alike however modern say research in physics shows that this actually is not possible particularly after the revolution of the theory of relativity it is known that space and time are intertwined in a complicated Manner such that any body that it accommodates that body with mass in addition although you can move forward and back in any of the 3 spatial directions you can only move forward in time