I am looking for an article to justify why you shouldn’t use weights in an indoor cycling class.
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I found this article for you hoping this will help
http://www.spinning.com/newsletter-ride-on/october07.html
While I was looking for it I came across a video of such a class on this blog http://funhogspins.blogspot.com/2008/05/aerobics-on-bike.html
Looks like there are spinning classes that are also incorporating resistance bands too!
http://www.indoorcycleinstructor.com/jennifers-blog/spin-class-with-resi…
Let’s hope you can educate this instructor before someone gets hurt!!