Is the film character-centric, or do you have any ideas for specific sequences, because the plot should probably tie into that.
Either way, my idea for an action film would always be having the main characters debilitated in some way, ex. sick, disabled while the fight off a power, like an organization that wants them dead. Maybe it's case of mistaken identity or the main characters really did something kill-worthy, idk.
Is the tone serious or comical? Is the genre simply "action movie" or would you okay with horror or sci-fi plots that contain a lot of action? (if you're open to sci-fi, I have way too many ideas)
Assuming you've got a small budget, you could probably film in a location available to you and build the story off that.
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MAN
"You know, I have a doctor friend I think can help you."
EDWARD
"Really? I'd like to meet him."