Standing on one leg is a sign of good health – and practising is good for you too - https://www.zmescience.com/science/news-science/standing-on-one-leg-is-a-sign-of-good-health-and-practising-is-good-for-you-too/

8 Examples of Isometric Exercises for Static Strength Training - https://www.healthline.com/health/fitness-exercise/isometric-exercises

Isometric Exercises Can Lower Blood Pressure: Here’s How to Add Them to Your Routine - https://nicenews.com/health-and-wellness/isometric-exercises-can-lower-blood-pressure-how-to-do-them/