Are there any online exercise resources or podcasts for children with VI?

There are lots of fun online options available. The following may give you some helpful ideas: 

British Blind Sport has an Active at Home section on it’s website, full of pre-recorded videos:.  Home | British Blind Sport 

Sport England has collated some online exercise platforms on its “Join the Movement” online hub with on-demand fitness content, most of which are either free or offer extended trials: Home | Uniting | The | Movement | Sport England. 

Cosmic Kids has a number of Cosmic Yoga videos, fun themed sessions aimed at children. 

RNIB Specialist Advice Service Advisors can give further information on this topic