aside from structural issues ...
To a limited degree, you CAN increase your range of motion in some areas. I'm not saying this WILL help your student, but it might.
I increased the movement in my hip downs by using a weight belt. I think Delilah of Seattle gave me the idea. I just put the belt around my hips and slowly lifted and dropped the hip, then did a hip down slowly, and bright it back to neutral. I think I did like 50 of these on each hip every day for about two months. My range of motion was substantially bigger after working this way. I did something similar with chest slides, and managed to get my horizontal chest movements a LOT bigger.
The key is slow practice, over a long period of time. And work the muscles in opposition. Work the downs as well as the ups.
It worked for me, and it might work for others. But you definately are limited by your own body's structure. Sometimes you can fake the "bigness" of a movement by making it sharper or by making it more "gooey."
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