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If you want to improve your cardio, you need to get your heart rate to at least 80% of your maximum BPM for at least 20 minutes (be careful though, if you're like 60 it will be pretty low).
It doesn't sound like you're experiencing muscle failure - you just want to improve cardio. I'd recommend just pushing yourself hard, and you'll get better. Do some extra cardio on your own time.
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"There is never an absolute answer to everything, except of course that you have to do your squats" - Rip
Training Log:
www.sherdog.net/forums/f49/my-training-log-fresh-biscuits-inside-1051048/
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