During this period researchers emphasized a quantitative, data-driven approach to understanding movement, moving from qualitative descriptions to measurable locomotor energetics and kinematics. The adoption of force platforms as ergometers enabled precise quantification of external work and energy expenditure in gait, while cinematographic and computational methods began to model limb motions and muscle function across species and activities. This era favored interdisciplinary collaboration between engineering and physiology, resulting in standardized methodologies and data-driven interpretation of locomotor performance and efficiency. Elastic energy storage and exchange emerged as central concepts, foreshadowing modern energy-aware biomechanical models that connect muscle-tiber body dynamics to overall locomotion efficiency. Historical significance: The period established a foundational framework for movement biomechanics as a rigorous, measurement-driven field, bridging molecular muscle mechanics with whole-body locomotion and highlighting the importance of rapid, accurate quantification of motion, force, and energy in both basic science and applied contexts.