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References:

2020 ESC Guidelines on sports cardiology and exercise in patients with cardiovascular disease: https://pubmed.ncbi.nlm.nih.gov/32860...
The proinflammatory effects of chronic excessive exercise: https://pubmed.ncbi.nlm.nih.gov/30884...
Source of the U-shaped curve: https://www.ncbi.nlm.nih.gov/pmc/arti...
Personalised exercise dose: https://pubmed.ncbi.nlm.nih.gov/29301...
The effects of endurance exercise on the heart: panacea or poison?: https://pubmed.ncbi.nlm.nih.gov/32152...
Exercise and the heart--the harm of too little and too much: https://pubmed.ncbi.nlm.nih.gov/25757...
Training for Longevity: The Reverse J-Curve for Exercise: https://pubmed.ncbi.nlm.nih.gov/32848... (suggests a slightly lower upper limit for benefit)

0:00 Can you be so fit that you don't die
1:06 Why exercise is great, actually
4:49 Exercise dose - how much exercise
6:30 The U-shaped curve
8:42 Extreme exercise isn't benign
10:02 The main heart problem with endurance exercise
12:49 Coronary calcification
13:29 Other electrical problems
14:16 Some key messages
16:36 Why is this so important
17:29 On the roof