When you want a shallow depth of field in action scenes you need an experienced focus puller.
And that job is done with a remote control so the person does not need to be touching the lens.
But they need to be close to the operator and they really need to know their job. It's very difficult
to get right.

Maybe in your case - just starting - you should use a deeper depth of field so more stays in
focus. Then as you gain experience you can try for more shallow focus and a good focus puller.

So if I have a smaller aperture I wont be getting as much light. I presume I need to use the iso to get a correct exposure as the shutter has to stay on twice the fps?

Is this right?

When doing fast action handheld shots such as someone running along the street you need to
have more depth of field or have someone running follow focus if you want shallow DOF.

Um not sure why you have repeated yourself?? You havent replied to my response but instead said the same thing twice.

I apologize.

To get a greater DOF you will need adjust the settings on your camera and you are
right, those adjustments will include ISO. The amount of light and which lens you
use will also come into play.

I was experimenting with this and I noticed that when I move the camera around because the light changes depending where you point it the exposure also changes. How do you make sure that as you move the camera that too much or too little light does effect the footage?

Are you using automatic settings?

no

There will be differences in light as the camera moves from light to shadow.
In an action scene such as someone running along the street I don't, personally,
feel it's an issue. The exposure should not change if the exposure is fixed. I'm
not sure why the exposure is changing on your camera.

Sorry maybe Im using incorrect terminology. What I mean is I can see the exposure level mark moving up and down depending where I point as the light changes. If I point towards the light then its blown out or if point towards the dark then its too dark.

Of course that will happen. If you set your exposure at, say, f/4.8 when you shoot into
a shadow the image will be darker - if you shoot into bright sunlight the image will blow
out. At the risk of repeating myself (I apologize in advance) there will be differences in
light as the camera moves through a street during a running scene.

Ok thanks. But how do I make sure it doesnt llok too dark or to light then?

As you can see there is more to making a movie than the camera and the camera
settings. You need to chose the location for fast action handheld shots well and
rehearse the path. The action needs to be well timed and the camera operator
well aware of what is being shot. You need to get good coverage. A couple of
guys running through light or shadow will not be a bad thing if you shoot it
correctly. I think the if everything in fast action handheld shots were in constant
focus and the entire scene in perfect exposure it would feel unreal.

But that's YOUR personal, artistic choice. If that what you want then you need
to not only ride the focus but the f-stop.