While the abs and back are most definitely challenged, the “core” concept is being refined to some of the deeper, intrinsic muscles around the spine and pelvis. In fact, it’s probably not specific muscles but how groups of important muscle work together and respond to dynamic movement.
This is where unicycling ROCKS… it forces us to dynamically respond to gravity, one of the most natural forces on earth, in functional ways that facilitate “core” strength.
I am trying to wrap my head around designing a rehab protocol using unicycling for my patients. I myself have not had any significant low back pain since November, when I started unicycling