The cast to support on parallel bars has long been used as a transition skill from under-bar swings to backward swings in support. More recently the Moy has replaced the cast as the primary transition skill taught in Canadian Gymnastics. The Moy is either a required element or a development skill required in competitive boys level 3 (age 10-12) to level 6 (aged 16 up) in both provincial and national streams. Most often the Moy is first taught from a support swing but eventually from a straight body downswing from handstand when the goal is to catch the skill in support (Figure 1). This downswing resembles that of the downswing in back giants on horizontal bar and is therefore used as a precursor to giants on parallel bars. As the gymnast grows both in skill and stature he must contend with the height constraint imposed by the parallel bars and their height restriction. This is generally manifested in a bent knee swing through the bottom of the swing. Prassas (2005) and Tsuchiya et. al. (2004), using college level gymnasts, both suggested close technique similarity between giants on horizontal bar and parallel bars except for the knee excursion. This is also seen in the Moy using the `giant downswing`. However a further progression of the Moy is a Tippelt or piked Moy in which the gymnasts initiates the down swing with shoulder hyperflexion and a large back arch followed by rapid hip flexion. The purpose of this study was to look at the angular Momentum characteristics of these 3 potential Moy downswings, no height constraint, back-giant and Moy piked and to compare these individual Moys to their giant technique used on parallel bars.
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