Nice workout ... If you feel tired, next time skip the last one ... the last one has to be the fastest one ... this is good for motivation ... 3:28 after 3:22 avarage is the opposite ... always aim for progression in times ... better to start with 3:25 and finnish with 3:20, than opposite ... keep up the good work! And good luck on the race day ... what is you goal? 36-37min?