A fellow Stoic, Javier Jose Fernández-Viña, created a useful info-graphic concerning a variety of Stoic exercises. If you're interested in what Stoics prescribe for mental well-being, be sure to check out his work.
Here is Today and the View From Above
...anyone who aspires to make observations about mankind should look upon the human scene as from some lofty height...
-Marcus Aurelius
Stoics have access to a visualization technique known as The View From Above. Using it, we take time to place ourselves in a universal context. One person in a community, one community on the earth, one planet in the vastness of space, and so one. Today I was introduced to an interactive experience called Here is Today. Here is Today is very similar to the View From Above. It places us in the context of time and challenges us to wrestle with the vastness of existence. I recommend taking a moment to experience it.
Calm.com is Ready to Sooth You
If Monday is already getting to you, Calm.com is ready to help lower your blood pressure. Go to the website, click the length of time you have to meditate, and a soothing voice will lead you through a guided visualization exercise. If you want to tailor the experience, choose a favorite background using the arrow buttons in the lower right. I've used Calm a few times already and it's a great service. It's such a simple and yet powerful idea. If only they would make an Android app so I can carry serenity around in my pocket.