I cross train in tae kwon do with muy thai, to havea wide variety but the tae kwon that my master teaches ( same as the muy thai instructor) is pretty good we are allowed to do grapplign and take downs whule sparing which i find builds experince for an all aroudn unfighting unlike in muy thai wher taking to the ground is illigal, so I decided to cross train in both and it defenetly imrpoved my kickbxoign kicks and movements.