Google code katas. These are sample programming problems that you can solve over and over in any language. They aren’t about solving hard problems, they are about practicing and forming good habits.
Similarly, google koans for your language of choice. These may feel like beginner tutorials, but they are about practicing until you have the nitty gritty details of your language committed to muscle memory.
exercism.io offers guided programming problems with pre-written tests for many languages.
The Pragmatic Programmer recommends learning a new language every year. This is great practice even if you don’t get to use those languages in your day job. Try to pick languages in a different paradigm than what you’re used to. This will often help you see better solutions to problems in any language. You can use the previous resources to learn these new languages.
For meditation, google for a mindfulness mobile app so you can have it anywhere, and as a little reminder every time you look at your phone. I use The Mindfulness App on iOS. I like it because it offers both guided meditations in different lengths, as well as meditation timers I can set to any length of time I want. Great for starting out with 1 or 2 minute meditations.
There are many ways to practice, these are just a few suggestions. However you do it, remember the goal is to train so that when the pressure is on, you default to good code instead of bad.