Sometimes we get tense because we "become" the problems in our life. So here's a little exercise to get some separation from them.
Sit comfortably in a chair, with your feet on the floor, uncrossed. Close your eyes, relax but stay alert. Picture yourself in your body, in the middle of your head. Be aware of the earth below your feet (ground if you know about that).
Now think of a problem in your life. Picture a bubble a couple of feet out in front of you, and see the problem in the bubble. Imagine what color it might be. Then put your focus on yourself, and be right in the center of your head, behind your eyes. Say hello to yourself. See that problem bubble out there, distinct from you, separate from you. Something you're experiencing or going through, but not you. You can even say to yourself "yep, that's a problem, but it's not me."
Send that bubble away, and let it pop. Then picture a big golden sun above your head, filled with your own unique energy. Bring it down into and around you, filling up your whole body from head to toe. Stretch, take a deep breath and open your eyes. Feel better?