It's all in the core ... and core strength adds so much to many other parts of riding.
Here's is a great conversation from my friend, physical theropist, and bike-fitter Paulie, if the time start link doesn't work, jump to 14:11
For folks around the Twin Cities, check out Go Physio
https://gophysiomn.com/
Oh and that bike training in Paulie's studio ... it fit my drop-bar Pugsley and fat tires on a drum are super loud! And we've worked with him on a fit for our tandem too.