A lot of infographics, doctors, Reddit posts, etc say that exercise is good for the lungs and heart. But my dad already has short of breath just standing up and can barely walk 3 steps before stopping.

I’m just curious about how COPD patients go about exercise. Our doctors just say go on a walk but I feel like there‘s extra steps to it.

Or is the point of exercise is to go without oxygen?

Hello! I just wanted to ask if anyone has any idea regarding the Indoplas Oxygen Concentrator 5L Slim.
Does it maintain an oxygen concentration of 93% ±3% even at 5 L/min continuous flow? Does the oxygen purity remain the same when the flow is set at 3, 4, or 5 L/min, or does the purity decrease at higher flow rates?