Practice without purpose, however, is nothing more than exercise. Too many people practice what they’re already good at and neglect the skills that need more work. It’s pleasant to repeat the things we do well, while it’s frustrating to deal with repeated failure. I see this all the time with dancers. If they have great leg extension but deficient arms, they will spend more time working on leg extension (because the effort is more rewarding - it looks good and feels good) and less time on their arms. Common sense should tell them the process ought to be reversed. That’s what the great ones do.” 
A little mid-week practice inspiration from Twyla Tharp’s book, The Creative Habit: Learn it and Use it for Life