I just completed my Les Mills training, I had Track 2 on RPM39 but, I would have to say Track 5 is AWESOME !
Other fave Track 5's are:
RPM #4 Gangsters Paradise - Coolio
RPM #10 Hit that perfect Beat - Bronski Beat
RPM #27 Shock to the System - Billy Idol
RPM #28 FreeStyler - Bomfunk MC's
RPM #33 I Want you to Want me - Chris Isaak
RPM #34 Pretty Vegas - ZeroOneZero