The plank exercise is widely known for its simplicity, accessibility and effectiveness. It perfectly develops the muscles of the body (cortex), especially the press. To perform the bar, lie down on a clean rug or sports mat on your stomach, and then focus on your elbows with forearms and toes. Hold this position for 30-60 seconds (if you are strong and trained, then more).
The timer below allows you to automatically count down to perform a plank, for 30 seconds and then 30 seconds of rest. And so 10 circles (I get 4).
I do this exercise every morning. I go to this page from my phone. I put the phone on the stand, stand in a plank position and press the "Start" button with one hand. I follow the directions and sound counts.