The weightlifting competition I saw was the women's 63 kg...

The weightlifting competition I saw was the women's 63 kg class. I'm not sure whether this means the actual women weighed 63 kg or the weights they lifted weighed 63 kg. Or possibly the temperature in the weightlifting hall was 63 kg. There's no way to know for sure without finding out what a "kg" is, and my belief, as an American, is that if I have to start understanding the metric system, then the terrorists have won.