The tension could also be coming from your neck. I would start a good daily stretching routine. Also, some vitamin deficiencies can cause tight muscles. Not sure if that is the case with you, but thought I'd mention it.
Good luck!

“The doubters said, "Man cannot fly," The doers said, "Maybe, but we'll try,"
And finally soared in the morning glow while non-believers watched from below.”
― Bruce Lee