Standing tucks at first may be hard to land, but I promise you they will be easy in the end. The one thing that may be throwing you off is not pulling hard enough. In running you have tons of power though your roundoff and backhandspring that help you. But in standing tucks or any standing...
To be honest it does not so much matter your size. The main factor is if you are able to stand up in the air correctly and if you are flexible enough to preform all of the body positions correctly.
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