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Andy Baxter is a Medical Exercise Specialist, world champion master's rower, and the designer of SciFit's new lateral trainer, the Side Step, which adheres to his philosophy of staying closed chain, compound, and bidirectional, while enhancing lateral strength and stability.
The positions of the remaining DOFs were calculated such that the closed chain between the feet was not broken.
It has been further suggested that lower extremity perturbation during closed chain activity that produces a sudden, forward, and either medial or lateral rotation movement of the trunk and femur relative to the weight bearing tibia may also alter the relative timing of the VMO to VL (21).
Closed chain exercises not only work the prime movers in patterns similar to those used in sports, but develop the support and stabilizer muscles at each joint in the chain.