It’s what they are told to say.
Just sitting in a chair and laughing to the point your body is actively engaged can help your heart.
Or doing certain breathing exercise can elevate heart rate.
The walking craze is just the next phase for all who didn’t catch on to the aerobic, run, or join a gym etc phases of previous decades.
I have had numerous clients who injured themselves by trying to walk so much and yes many times their cardiologist suggested it. And they don’t want to hear common sense of vary exercise, moderate take a week off, stretch or otherwise loosen up.
Most still eat processed foods but think all is well because like good little lemmings they follow doctor talking points.
People are going to do stupid things, thinking once they’ve survived open heart surgery, they are cured and go back to whatever they were doing beforehand, doesn’t mean walking is just a craze.
I told my wife after the surgery, regardless of who you talked to or how much information you’ve read, until you’ve experienced open heart surgery you have no idea what it’s like or how you will react to it. Laughing like coughing after open heart surgery is likely to be painful considering your check has been cut open and has come close to healing completely.
All I can say from personal experience is, walking after open heart surgery was the single best thing I did to improve how I felt and mentally made me feel a lot better.
My heart condition came about from a birth defect I was born with, I had what is known as a Bicuspid Aortic Valve which is genetic, not from poor lifestyle choices.
I am in cardiac rehab at the moment and the first thing they do is have you walk 6 minutes wearing a heart monitor, then check your blood pressure immediately after the 6 minutes, they want to see what the maximum BP and heart rate were, then 10-15 minutes after you’ve rested they take the same readings to see if your heart rate and BP have returned to normal.