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I am having some trouble keeping my swing leg straight and when i do i cant seem to continue my swing very long. I normally end up in a tuck and shoot . But even when i do that i have trouble keeping my hips moving. I know the drills to do off the pole, but my main question is what muscle groups or other anatomical things are used in order to keep this movement fluid. I also have trouble with relaxing my shoulders as my upper body tends to come up. If you want to see my videos they are on youtube, my channel is THEupANDcomer1. Yes i know the name is lame i made it awhile ago. Please leave any advice as i am sure there are other vaulters wondering similar things.

Hard to have a good trail leg swing when the takeoff is under. Fix that and then you have a chance at good trail leg swing.

Normally imnever under iin fact im out 2 or 3 inches a lot

Good, I must have looked at someone else's jump on the video site. Then try practicing on a high bar or high parallel bars to get the feel of a long sweeping trail leg in an easier environment.