Whats the best way to stretch my Latissimus Dorsi (lats)?!

Whats the best way to stretch my Latissimus Dorsi (lats)?

I was in a car wreck in the mid-90's and ever since then when I 'm on my feet for an extended amount of time be it housework working out walking running etc. My lat on the right side (right underneath my shoulder blade torward the middle of my back...starts aching. I know I need to stretch but not sure of the best way...Any suggestions? Even if it's not stretching I just don't want this to hurt anymore....I'm too young to have to stop and rest until it stops hurting.

Thank you!

try this.