Really hard heartbeat?

Does anyone else ever get the sensation of a really hard heartbeat? It is extremely hard and scares the crap out of me. I had a really hard one today. Sometimes my heart races after an sometimes it doesn’t.

Me the past few days 

It can happen with anxiety.  Not harmful when due to anxiety but it’s a good idea to have a checkup with your doctor for peace of mind.  

Stay hydrated 

This happens all the time.... And with little movement, my heart starts racing like its running a marathon!!! Does that happen to you?