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well, when I do a regular cardio routine.. (I'm not now, cause I'm trying to put on mass) but I tend to get bored doing one particular routine so much.. often what I'll do is I mix it up.. I do say jump rope one day, running another day.. running up and down stairs yet another.. this way it stays interesting, and sometimes I'll say.. do 10 minutes skipping, then proceed to 2 minutes jumping jackes (without break) and then run a few laps around the block (5 minutes) run up and down stairs for 3, then do another 10 minutes of skipping.. that one is fun.. I hope to get an exercycle soon though, so I can add that into the cardio routine.. when I'm doing cardio indoors I like to put music on.. that is good too..