I know it's not yours, but this is one of the worst ideas I've ever heard.
It's basically impossible to implement, especially below elite level, as we can only estimate muscle mass and sports categories need precision.
In addition, it would mean the end of elite women's sport. Look at weightlifting records, men outlift women 20+kg heavier than them.
It also ruins many sports, who wants to see the under 50kg world cup, followed by the under 60kg world cup, followed by the under 70kg world cup?
It's the kind of idea that someone who has never played, watched or thought about sport would come up with.
Don't you think it would be a bad idea to basically end women's elite sport in most sports?
"Sorry, girls, you'll never be good enough. Just watch the men play, eh?"
Over the past decade, many women's sports have been growing in popularity and deservedly getting more recognition, why ruin this positive trend?