http://en.wikipedia.org/wiki/Rhomboid_major_muscle
I"m assuming he's talking about that...and not the shape ....
I would run for cardio...a mile ..even if you have to walk part of it...do it. When you can do that...doesn't have to be comfortably, but you can do it....like in two weeks...move up to two miles. Get decent at that, then you can decide where you want to go from there...
hit the gym
eat right and drink water.