Intra-class correlation coefficients (ICCs) for whole-body kinematic features, yaw angle (Ψ) and body kinematics (lateral body angle, χ_GR,XZ, and frontal body angle, χ_GR,YZ), and for left–right wing kinematics, wingtip speed (U_tip), average elevation angle (), stroke plane angle (β), stroke amplitude (Φ_SP) and elevation amplitude (Θ_SP)