First, you'll need to find a pen. I usually prefer using a dark blue or black pen because it shows up better on skin.
Then draw a small trampoline under the heart line on your hand, with the top of the trampoline right on the heart line.
Then draw a small stick man just above the trampoline.
Then move your fingers up and down, and it should look like the stick man is jumping up and down on the trampoline.