One way to keep your movie moving is to break it down into sequences. Each sequence should act as a mini-movie. That means there should be a goal for each specific sequence.
In the end, the characters either achieve their goal or fail at it, and we then move on to the next sequence.
Let’s look at how Aliens does this. Once they’re on LV-426, the goal is to go in and figure out what the fuck is going on (new sequence). Once they find the colony empty, their goal shifts to finding out where the colonists are (new sequence). After that ends with them getting attacked by aliens, their goal becomes get off this rock and nuke the colony (new sequence). Once that fails, their goal becomes secure all passageways so the aliens can’t get to them (new sequence). Once that’s taken care of, the goal is to find a way back up to the ship (new sequence).
Because there’s always a goal in place, the story is always moving. Our characters are always DOING SOMETHING (staying ACTIVE). The sequence approach is by no means a requirement, but I’ve found it to be pretty invaluable for action movies.