Why do I always feel my heartbeat in my arm?

Interesting that you can see your pulse on your arm, you must have a strong heart lmao. Sometimes when i lie down and hold my breath i can see the pulse on my stomach.

That's your pulse, you can pretty much find it anywhere where there's an artery (major blood vessel)

Your heartbeat can be felt or seen pulsing in various parts of your body including your arms, feet and neck. It let's you know you're alive.