Amongst classical competitive mods (not talking MMA / Boxing people, they experiment a lot) there's -9.82 (classic.tbm gravity) mods and there's -30 mods. And rk-mma.

Judo, taekkyon, wushu and variations - all great and fun to play, clashes are usually brief and sharp, DMs are super frequent. Confident movement on land is oftentimes tricky with such low gravity (hence why they had to put mushu in a box). Much lower -30 gravity been deemed decent for realistic movement, most parkour and spar are played in -30. As well as ninjutsu, lenshu, aikido and variations. Aikido has grabs and very close engage distance, therefore most aikido fights end up being all about trying to manipulate your opponent into disqualification. In most matches players are in contact for the whole time. Lenshu is played with no grabs, a bigger gap between players and a larger round dojo with a timed DQ within it, providing more freedom of mobility. DM threshold feels fair, you need to land a good kick to get one (luck plays here too, of course). I enjoy lenshu for the freedom of movement - instead of constantly pushing each other around, in lenshu you get to move about in-between clashes, prepare and execute flips and kicks on your own. Rk-mma is played for similar reasons, except it's -20 gravity - feels a lot like lenshu but wrong. Still, both of them are decent mods for tricks and kicks imo