Figure 5. Each graph represents ten shoulder-hip (SH) continuous relative phase curves for participants 4 (P4) and 8 (P8) during acquisition of a sequential reaching task: a) and c) early session one; b and d) late session three. With practice P4 demonstrated increased SH Mean absolute relative phase (MARP) and point-estimation relative phase (PRP) (increased in time spent in anti-phase relationship) and P8 demonstrated a reduction in SH MARP and PRP (increased time spent in in-phase relationship).