Baseline Sit n Reach Trunk Flexibility Tester is specifically designed to evaluate the flexibility of a selected set of joints and small muscles including the lower back vertebrae, larger hamstring muscles and hip flexor joints. These groups work together to provide trunk flexibility. The deluxe model allows for the tests done with the standard model as well as modified Sit n Reach tests. Modified testing protocols vary the scale start point, this normalizes scores to account for variation in the arm and leg length of the person being tested. The center channel is locked into place when the start point has been determined.