To photograph show jumping inside with bad lighting makes your photoshoot a little bit harder. If you want to do catch a really sharp action shoot you will have to use a very fast shutterspeed but doing that means that you need to have a lot of light to go into the lens. With a large aperture you will get a lot of light but it will probably not be enough, then you have to increase your iso value but when you do that your photo will be appear with a lot of grain in it. Unfortunately this is your only option in a situation like this.
My photos above are very sharp but you can see the grain in them!