Physical expressions of emotion can be problematic, even though they’re justified by the “Show, don’t tell” mandate. But there are often better, more artful ways to give us insights into the interiority of your POV characters.
How to render scenes effectively
Do you take us to a point of conflict and then, rather than allow us to see it play out and get all worried about the outcome, you summarize it or just resolve it quickly? Stretching tension means you lengthen the scene but also make it more gripping. Don’t push the action off-stage or rush through it. Linger on the most tense moments of the story to maximize engagement.