Lets start getting that little cock of yours a bit worked up shall we.... Oh and I forgot to mention before you will not be letting that thing go soft until i'm done with you ok?
You're going to need to open http://www.metronomeonline.com/
Now set the metronome to 72 and stroke at this pace until the clock on your computer has changed twice.
Now that was easy, I now want another two clock changes with the metronome set to 104.
That's better, now another two changes at 138.
When you're done you may continue...