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User363614 said on 09 April 2012

I’ve always gone by the premise to improve cardio-respiratory function you raise your heart rate to 150+ beats per minute for 12 minutes, or 140+ bpm for 20 minutes, or 130+ bpm for 45 minutes. Other models have been introduced to factor in safety such as 220 minus your age to find your maximum heart rate, then 60 to 80% of your maximum heart rate for training, etc. It’s difficult to comprehend how people doing Tai Chi would attain beneficial cardio-respiratory levels. However, since we may be talking about people that would otherwise be suffering heart failure, this may indeed be appropriate in such instances? No disputing there are other benefits such as stress relief, especially from social interaction.