Go to the local park and do some sprints on the grass. There's nothing more invigorating than running as fast as you can. After the sprints, fall on your back

Go to the local park and do some sprints on the grass. There's nothing more invigorating than running as fast as you can. After the sprints, fall on your back and do some sky gazing. The sprints clear your mind, the sky gazing relaxes you and lets your mind wander ;-)