1) Whenever he saw his boss approaching, he would tense up in anticipation of receiving criticism.

2) The swimmer tended to tense up before races, causing her performance to suffer.

3) I could feel myself starting to tense up as the deadline for the project drew near.

4) Don't tense up during your yoga practice; remember to relax and breathe deeply.

5) When she heard a noise in the dark alley, she couldn't help but tense up with fear.

6) His muscles tensed up as he prepared to lift the heavy weights.

7) The tension in the room made everyone tense up, waiting for the argument to erupt.

8) As the car skidded on the icy road, I felt myself tense up in fear of a collision.

9) The actor would always tense up before going on stage, but his performance was flawless.

10) It's important to recognize when you start to tense up during stressful situations and practice relaxation techniques to calm down.