Interestingly enough it was caused by stress and caffeine. I cut out the caffeine but it didn't stop completely until some events in my life changed.
I agree w. itdood...you need to make an appt. but just a word of caution...caffeine will definately affect your heart rate....and that means pepsi or any colored sodas, coffee, chocolate, etc. Rather than worry i would have it checked out...sounds like you are in good physical shape and young but you can never be too cautious when it comes to our hearts.....good luck
It's probably ectopic beats, like PACs or PVCs. But we can only guess. Getting a check up once in a while even if you feel great is always a good idea. If you haven't had one in a while, head it to get a checkup and discuss this issue with your doctor.