Time to be inspired by more 'rearward' excellence - guys who have not neglected their lats and so forth. It's not just muscle though - you need flexibility in the back (and shoulders) too:    ...but back to flexing! ... ... Here's the way to do it (well, there are many exercises actually but we're about out of space for more today!)...      

Latissimus dorsi - responsible for those sought-after 'wings' in serious bodybuilders. Consider too trapezius, rhomboid and those small muscles which comprise the rotator cuff. Also in a back view, we can admire the development of the rear and side deltoids.  We commend the increasing tendency for more and more fit guys to post their back views as well as chest and abs in normal 'flexing'. So let's be inspired to work harder on the bits we have to stand between two mirrors to see!    The last word goes to the young 'uns, as usual!