Just bought one of these last week. Thought I'd share for my MMA buddies. Here's a GPS watch with a heart monitor included. The Garmin Forerunner 310XT is pretty badass and not too rough on the wallet either. Now as an MMA fighter it is crucial that heart rate is kept to a minimum throughout your time of important performance. On the other hand it is a great device to show to your trainer that your heart rate needs to be increased. Check it out, I'm loving mine.
Garmin Forerunner 310XT