This is the main riff of the song:
E-x----x----x----x----------------------------------------
B-x----x----x----x----------------------------------------
G-0----x----x----x----------------------------------------
D-2----4----5----7----------------------------------------
A-2----4----5----7----------------------------------------
E-0----2----3----5----------------------------------------
[ Tab from: http://www.guitartabs.cc/tabs/b/bush/breathe_in_breathe_out_tab.html ]
E-x----x----x----x----------------------------------------
B-x----x----x----x----------------------------------------
G-0----x----x----x----------------------------------------
D-2----4----5----7----------------------------------------
A-2----4----5----7----------------------------------------
E-0----2----3----5----------------------------------------
Just repeat listen to the song and play.