ive seen a player with a multiple step runup on long approaches and actually he make quite a few long range shots that way.
a moving launch has a greater distance potential than a still launch.
a longer reach back has a greater distance as well.
all the squatting and jumping and walking or running is doing is emparting more potentialn forward momentum.
witch ever one method or combination of meathods works for you the practice plenty and enjoy the results.