Always, my range of motion is excellent. I used to race single track, play hockey, soccer... If you ever played a sport where you can can go from full out to head over heals in less than second, you better not be Musclehead Motionless, or you will tear shit up like paper in a shredder.
better circulation, better nutrient supply, better growth, less injury, greater capilary growth, avoids blood pooling.
Ronnie Coleman can do full balls to floor splits, so dont chime in with 'it inhibits growth' or an such nonesense, it helps everything.