Turn the metronome off by clicking "Off," but don't close out of it.
Now it's time to go on a run. You can run in place if you want, but if you have room to move around, I'd prefer you run so that you're moving. Time your run for 2 minutes if you have a stopwatch; otherwise, count to 2 minutes in your head while you run.
When you get back, get on your knees and get your dick hard again, if it's not already.