I do spin classes on Thursdays after my tempo runs.  Our classes are at 9:15 am so most people don't have to be up as early, but I do my tempo runs at 7:00!  There is also a 5:15 am class for those that like to spin before work!  Are you going to invest in cycling shoes?  They do make a diffence! AC/DC's "You Shook Me All Night Long" is my favorite to get the heart pumping and the adrenaline rushing through my veins!