I feel this extension work is too advanced for most older clients but I like it 

Elizabeth can you be more specific?  I use quite a bit of this with many of my older clients.  Was there something in particular you had questions about?

So yes my 90 year old would like the beginning part and maybe even the side weighting … but the extension would be too scary and advanced - what exercises would you recommend for extension for seniors ? 

Elizabeth D thank you... let's have a private conversation about what I'd recommend for extension for seniors.  This is a rather large topic to cover and not one that I can give a simple answer to.