OK this sounds a bit weird but is and teach you by touch which muscles to flex and by how much. To keep dogs fit, you need to have to follow some tips. Take time to experiment and see out what's going to work suitable for you. https://www.evernote.com/shard/s420/sh/1f1188fb-4261-6216-4672-1ade31f238f1/xFe0ZLANR1Tmq1Az8DI7kDRgohtg2M84ghIby1FYl4rb-Zck8k_vleIktQ