Actively squeezing the glute on one side can improve hip flexor range of motion on the opposite side due to reciprocal inhibition and also activates the glute.

“I squeeze my left glute because of reciprocal inhibition if I squeeze my left glute it will tell my right hip flexor to turn off now I can get more range of motion by squeezing my left glute in addition I I turned I activated my glute my glute got warmed up here I got going and now I'm breathing through my low belly and opening up all diaphragm hip flexors this entire girl does y I can feel it opening up right”