Thanks a lot, peterl94.
So here is exactly what to do. Step by step.
First create a python file called conrod.py and save it in the macro directory.
Then open crank_simul.fcstd in FreeCAD.
Next, down in the python console, type "from conrod import *" without the quotes.
Finally, type "animation.stop()" without the quotes which will stop the animation.
To start it again, you can just type "animation = Animation()" to start the animation over from the beginning or type "animation.timer.start(50)" to continue the animation from where you stopped it.