Mix It Up
It's good to follow a healthy routine, but keeping your mind and body guessing is better for your brain functionality in the long run. If you usually go for runs in the afternoon, try taking a dance class at the same time instead. Pushing your limits and determining what you do and don't like to do is just as important as maintaining a routine.
Play Chess
Playing chess literally makes you smarter, plain, and simple. This game forces the player to think ahead and visualize all possible outcomes of scenarios before you even get into them. That is if you're playing the game correctly.