Michael Mosley explains how you can start to get fitter within just 60 seconds with HIIT. What are some of your exercise tips, let us know in the comments below? Subscribe: http://bit.ly/SubscribeToEarthLab

FOOTNOTES:
1 http://www.nhs.uk/Livewell/fitness/Pa...
2 https://blogs.nottingham.ac.uk/newsro...
3 http://www.bbc.co.uk/news/health-1717...
4 http://www.yourhormones.info/Hormones...
5 http://www.telegraph.co.uk/men/active...
6 http://www.reuters.com/article/us-har...

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