Planks are great! Rotary torso with a oly bar works nicely to, even weighted up to 135 lbs. The fighters/boxers blocking mostion I mentioned before is one heck of an oblique workout too if you haven done it. The sharp exhalation with each rep along with the explosiveness creating resistance makes this one very surprising as far as difficulty and effect. Not to mention you ar training yourself to keep your elbow close to your body for blocking shots. Could come in handy in a skirmish.