Wrist pain means time off.

Good practicing is enjoyable and effective. Enjoyable means you can find joy in it. If you're going to enjoy your practicing – and for me that's essential – you have to keep an eye out for what lights you up.

Getting close. Paying attention. Smoothness. Non-musical practicing issues.

Here’s how I practice concentrating.

Approach tone through touch; my brain has a minimum portion size; manage my time; Swiss cheese technique.