Shellevate: Meditation Game

Make meditating into a habit with Shellevate, the meditation app you'll get addicted to. Build a streak by meditating consecutively, earn gems to purchase streak freezes in case you miss a day, and coolest of all, collect and raise turtles from their eggs. The longer you meditate, the rarer the turtles you can find.

It's turtle-y awesome. Hopefully you have a shell of a time building one of the most useful habits you can.