For me it is anything that has a faster tempo and is hard hitting Also when songs are more repetitive and have a lot of beat drops.
So for example:
-Very Good by Block B
-Fire by BTS
-Miroh by Stray Kids
-Alligator by Monsta X
maybe these aren't workout songs at all lmao but heres what i listen to
-hellevator by stray kids
-kick it and nonstop by nct 127
-stronger by nct dream
-win by ateez
-latata by (g)i-dle
Jopping (Superm), Take off (Wayv), Yayaya (Stray kids), Kick it (Nct 127), Hala hala (Ateez), Fire (Bts), Getting closer (Seventeen) and Chain (Nct 127)
hi high by loona
dalla dalla by itzy
pow pow by elris
miroh by skz
very nice by svt
rookie by red velvet
chain by nct127
boombayah by blackpink
second grade by bts
Chan from Stray Kids said on a Vlive that he listens to Inferno by KARD (i think its this song) when working out
personally i listen to anything that has a good, visible beat that can match my pace or like fire me up (like miroh - stray kids, fire - bts, energetic - wanna one, etc)