are you listening to music on your phone? or on an iPod touch? if so, just think of a song you like doing cardio too, then make a Pandora radio station with that song. it will come up with the play list for you. easy. and it's free.
I start off slow with Seal's A Change is Gonna Come to remind me why I am on the bike then kick into more up tempo songs and end with Shut Your Eyes by Snow Patrol to cool down.
A Change Is Gonna Come Seal Rain Down Love (7th Heaven Mix) [feat. Siedah Garrett] Freemasons Relight My Fire (Workout Mix) d'Mac Uninvited (Club Mix) Freemasons Green Light (Freemasons Remix) Beyoncé Don't Stop Movin' S Club 7 I Want Candy (Workout Mix) Sex On Fire Kings of Leon If Freemasons Freemasons ITunes Mash Up Freemasons Ain't Nothing But a Heartache (Club Mix) Freemasons Pjanoo (Club Mix) Eric Prydz Your Love Is Lifting Me Higher (Eddie Baez Mix) Gioia Bruno This Time Baby Jackie Moore Shut Your Eyes Snow Patrol