Paper is linked in the article: https://www.ahajournals.org/doi/10.1161/JAHA.121.020980 https://www.ahajournals.org/doi/10.1161/JAHA.121.020980 Intervention se

Paper is linked in the article: https://www.ahajournals.org/doi/10.1161/JAHA.121.020980 https://www.ahajournals.org/doi/10.1161/JAHA.121.020980 Intervention section mentions that study participants used a device called 'POWERbreathe K3 inspiratory muscle training device'. Googling the device provides these videos: https://www.youtube.com/watch?v=nd5U7mDhFi4 https://www.youtube.com/watch?v=nd5U7mDhFi4 & https://www.youtube.com/watch?v=ZvtZW5Q1ox8 https://www.youtube.com/watch?v=ZvtZW5Q1ox8 When I was working out in the gym in the summer in pandemic season with masks on, I noticed my breathlessness, the movement of the mask amplifies the visual and it was easy to draw a comparison in this way with my surrounding gym peers, and indeed I realized my lungs were in much worse shape than I'd expected, so I'm going to give this thing a try. Edit: model featured in YouTube is not the same one the study used but close ‘nuff to get the idea.