Single-leg trap bar exercises in the style of the Reeves deadlift (hands on plates, not bar) provides the perfect stimulus for crushing every muscle in the body.
Performing single-leg trap bar movements provides the perfect stimulus for training every muscle in the body from head to toe while simultaneously working on balance, symmetry, and stability.
You can also expect some soreness and muscle growth in the glutes and hamstrings. As an added bonus, it's incredibly effective for improving foot and ankle strength, along with lower body mechanics.
Those guys who think planks and Bosu Ball triceps kickbacks are giving their core a good workout are poor, pathetic slobs. If you really want to work the core, you've got to raise the weight over your head.