Best lens for kids sports indoors?

Here is what the site says about that.

From Sigma 200mm f/2 DG OS Sports: Sigma 200mm f/2 DG OS Sports: A prime lens by Sigma for Full frame cameras, 200mm f/2. A stabilised fast telephoto prime for indoor sport and portraits.

From Your first camera: What a camera does better than a phone: - Zoom. Phones are great at wide angles and get weak quickly as you zoom in. A camera with a telephoto lens keeps its quality at long focal lengths: wildlife, sport, kids on a football pitch. - Low light and motion. A bigger sensor collects more light, so moving subjects indoors or at night stay sharp without the smeared, over-processed look. - Background blur that's real. A fast lens on ...

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