Polar Bluetooth heart rate monitor which allows me to monitor how my pulse varies as I take part in various activities.
I find that when I go running my pulse goes up to 145-150 BMP and stays there for ~4 minutes before falling back to 120 BPM for the remainder of the run. When I use the cross trainer, my pulse climbs to roughly 170-180 BPM and stays there.
Interestingly when I meditate, my pulse stays level around 85-90 BPM. I think this is an indication that I am not very good at meditation, because this is higher than my normal resting heart rate of 75-80 BPM. If I were a Zen guru, I should be able to bring my pulse down very low while meditating.