Forearm exercise tier list! Three will make it into S tier! Barbell isometric holds – C tier Barbell isometric holds. These are great for building grip strength, but… they’ll also fatigue your back, traps, core and every stabilizer top to bottom.. So if you’re simply trying to grow your forearms, they’re a very inefficient way to do it. High C tier. Farmer’s carries – B tier Farmer’s carries