How do you practice to become an expert?

What does it take to become an expert in a field? Conventional wisdom tells you do something for 10000 hours, and voila, you’re an expert! No, says K. Anders Ericsson, an expert in the field of expert-level skill acquisition, who’s a professor psychology at Florida State University. It’s not how much time your spend learning, but how you use that time. Experts parse their learning into tiny slices or segments, practice that one action endlessly, but most importantly, they observe what’s happening and make imperceptible adjustments to improve. This goes for athletes, surgeons, chefs or spelling bee champions. Ericsson refers to this as deliberate practice: small tasks are repeated with immediate feedback, correction and experimentation.
The question is this: Are our students and we as teachers engaging in deliberate practice? Or are we just doing the same things over and over, without knowing what and how to change? Are we improving over time and growing, or just spinning our wheels in the mud? 
(Source: Work Rules!, Laszlo Bock)