I've been doing these for about six months
https://www.britishcycling.org.uk/knowledge/article/izn20130617-Phil-Burt-s-Big-Four-0
Hold each one for three reps of 30+ seconds.
I was happy to find a simple routine from a trusted source after trawling through mounds of random conflicting advice from various websites.
@dbr started
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I've been doing these for about six months
https://www.britishcycling.org.uk/knowledge/article/izn20130617-Phil-Burt-s-Big-Four-0
Hold each one for three reps of 30+ seconds.
I was happy to find a simple routine from a trusted source after trawling through mounds of random conflicting advice from various websites.