Title pretty much says it all. I need to improve my core and flexibility. So much stuff out there and I have been trying to make sense of it all but I would like one source and just run with that. I cannot do crunches due to back pain. That is the only constraint. I am thinking a 20 minute program, maybe 30 and would like to use some kettle balls, etc.

Thank you for any info directing me to links and resources.

Wes