I do a bunch of EVA foam and hard plastic ball (softball sized) rolling. Rolls away most of the stiffness in the muscles. Do some mobilization exercises for ankles, hips, and thoracic spine, too. Insofar as there may be a slight loss in strength from the rolling it is more than made up for by the gains in mobility. Then spend quite a bit of time with just the bar trying to get the positions smooth and comfortable and the transitions between them.