Strength training for cycling

I know that this is a hot topic at the moment and after seeing GCN's video with Tinkoff-Saxo, something that I have been meaning to do for a while (when fit and racing again). Anyway, I saw this post on facebook and thought that I would share with others. Have others tried strength training and found it to be useful?
https://www.facebook.com/wyndymillabikes/photos/a.152293484798873.36112.110810008947221/1697273346967538/?type=3&theater
https://www.facebook.com/wyndymillabikes/photos/a.152293484798873.36112.110810008947221/1697273346967538/?type=3&theater
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I was thinking exactly that, just the other day. "Speak of the devil and he doth appear"