Fig. 9. (A) The average stress–strain relationship for three participants across the range of elastic moduli determined. The elastic modulus for each individual was determined by fitting a linear regression through the stress–strain data, as displayed. (B) Group average stress–strain relationship at five points during both loading (filled diamonds) and unloading (unfilled diamonds) during the hopping movement and the standard deviation of stress and strain measurements (error bars indicate ±1 S.D.).