The skinnier does not mean the more athletic?

I am 165 cm tall, weigh 56 kg and my bust measure is 88 cm, belly measure is 63
cm and my hips measure 91 cm.

My mom is 174 cm tall, weigh 50 kg and her bust measure is 78 cm, belly measure is 57 cm and her hips measure 70 cm.

My mom claims that she is more athletic than me because she is skinnier than I am. But I think I am more athletic than she is.

In which branches of sports can my mom beat me?

If you think she is more athletic then I am, please tell me the reason.
The skinnier does not mean the more athletic?
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