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thanks for sharing your experience > The lungs and heart are muscles too... sometimes people forget this ... are there really muscles in the lungs ? and is t

• jqm 12y ago
  Good point. I don't know that the lungs are technically muscles (probably they aren't...I'm not going to cheat and look it up until later). But for this purpose they behave enough like muscles... i.e., they seem to grow stronger. Or maybe it is indeed muscles like the diagram being strengthened. Perhaps someone with a bit more actual physiology knowledge can answer. Edit: Also, I forgot to mention, I do this twice a week and sometimes thrice a week, with off periods of a few months every 5-6 months or so. I've been doing HIIT in periods for 3-4 years since I first read about and I'm a believer. Big change.