For the one in five Americans with a disabling or chronic condition (U.S. Census), there’s a point when the insurance-covered rehabilitation taps out—despite the need for ongoing restorative physical activity in a safe environment. Northridge, California based entrepreneur Aaron Baker is picking up the slack with his low-cost rehabilitative fitness center, called the Center for Restorative Exercise (C.O.R.E.), that he hopes to expand in 2016.

C.O.R.E. was inspired by the...