The biggest thing I see is that you are not getting your hips back at all. If you look at the one arm side view video and use the doorframe as a point of reference, your hips don't move backward at all into the hinge. In fact, your hips are actually a little further back at the top of the swing than at the bottom -- the opposite of what it should be.
A couple of smaller things:
--You have a little scoop in your two hand swing where your knees move forward at the beginning of the upswing instead of just extending the knees and hips together. I don't see this in the one arm swings.
--Your next is flexed forward at the top instead of standing tall.
--You free arm stays up in the "guard" position throughout the one arm swing. This isn't necessarily a problem, but you may find you get more power swinging the free arm back on the down swing and up into the guard position on the upswing.
Hope this helps.
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Excellent input from Steve W. of course, he always sees a lot and gives a good assessment. I also saw the scoop of the knees, but totally missed the big one, that your hips were not getting back at the bottom of the swing. You are generating a heck of a lot of power from somewhere to swing the 40kg like that, so you definitely have a lot to work with. Your timing looks good, your grip is solid, and your power transfers well to the bell. On the 1H swing, your shoulder looks a little disconnected to me, so perhaps you could work on the solid shoulder pack there (I usually have to go to a lighter weight to make an improvement, and then go back heavier). Good work...
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I want you to try one thing:
swing barefoot.
all other tips you got still apply. I sense when you have better stability a lot of your errors will slowly disappear
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Bend your knees a little more. If it helps, think about squatting. A swing is obviously not a squat, but this cue typically helps folks who have a more straight-legged swing... I've found that this typically gets rid of the "scoop" that Steve and Anna mentioned.
For reference, take a look at the position that you're in when you set the bell down in the 1H Swing side-view video (pause it at :10 when you set up or at :20 when you finish). That should roughly be the bottom position of your swing.
Mark's comment is good too, although I'd maybe change "slowly" to "probably quickly"
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I'll second a couple of the comments -
First off you are generating power enough to execute the move safely, so really just push your tailbone back more - I tell folks sometimes to imagine you're putting your backside into a tire swing at the bottom of the movement.
And absolutely switch to barefoot!
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Additional tip: 2H Towel swings.
Lengthens your lever and will force you to push those hips back to eccentrically load up the necessary power to spring back into the top position.
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