Isometric exercise

Isometrics (Exercise)
Resistance exercise
Resistive exercise
Resistance training (Isometric exercise)
Strength training

Strength training for speed, 2022: p. 92 (strength training; isometric exercises) p. 108, etc. (examples include various types of planks, renegade rows, press-ups, ball crunches, v-sits, leg raises, Romanian deadlifts)
Penn State College of Medicine website, Aug. 2, 2023: Introduction to strength training (strength training (a.k.a. resistance training); a type of exercise that causes your muscles to contract against an outside resistance, which can be from from your body weight, weight machines, medicine balls, resistance bands or dumbbells)