Seriously, if you can, just do it. I decided to work on my hip mobility and splits after a very long time and my god, I feel so much better. It relieved pain in my legs, back and a little bit of my desk-borne headache. If you have trouble getting started, find one particular stretch you would like to be able to do, preferably some tangible goal like a full split, and hyper focus on that.
Yoga is the only reason I managed to punish my body as much as I could while running. Downside of this flexibility is I ripped another set of pants.