You'll need the Rogue Landmine Handle (the angled one), but it's absolutely worth the purchase if you're trying to smash the yoke.
This exercise is sort of a pairing of mini-rows and shrugs. They really smash the middle and upper traps while also bringing in the rhomboids. Shrug and row together, lifting the shoulders up and then pulling the elbows back as well. Hold the top of each rep for at least 3 seconds before lowering.
Do 4 sets of 10-12 reps and your traps and upper back will be smoked.
In honor of the League Championships that start tonight, we present a look at how baseball has pretty much abused weight training and sports preparation in general. Hell, listening to Eric Cressey, it's a wonder any of them can throw a ball.