What's the science behind how 4 seconds of stimulation was arrived upon?Updated 9 months ago

The cadence has been proven as the most effective rhythm for full-body EMS training. 4 seconds allow for clean execution of the exercises (e.g., bench press) and focus on your breath work. At the same time, 4 seconds also allow you to relax your muscles, shake out your body if you like, and get ready for the next exercise. Last but not least, having even timing between tension and relaxation will allow you to get into a groove.