To efficiently execute a powerful swingthrough, there can be no hesitation. Ideally, whether swinging into inverts or vert kicks, you want to finish the first trick early so you have time to open up into the swingthrough position before you land. For backswings, this position is widely known as the ‘eagle’ position. Lesser known names include the ‘seagull’ for master swings, and the ‘flamingo’ for frontswings.
To efficiently swingthrough from any trick, regardless of swing type, or direction of the flip or twisting axis, you want your trick to stay somewhat level, ideally. Imagine a skipping stone, rather than a bouncing ball. Too much rise and fall in a trick creates a lot of stress for the landing leg to absorb and counter. By creating a skipping path with low, fast tricks, the leg doesn’t need to absorb nearly as much energy, and the body can more freely find its own efficient path. Finally, once you’ve mastered fast, generally lower tricks that finish early enough to allow for the swingthrough set, you must commit to doing it. This transition, more than most, greatly hinges on simply going, regardless of the conditions. It may seem scary, but bails are easier to control than a muscled swingthrough is.
In the vide above, notice how the center mass of the performer stays relatively level, with the shoulders and hips rotating around it, regardless of swing type or direction of flip. This is the key concept for repetitive swings.