Chris Colucci wrote:
Cable crunches (one-arm and two-arm)
Does the use of one or two arms really make a significant difference?
I suppose I could just go and find out myself, but that would require me to actually work my abs more often.[/quote]
The one-arm cable crunch lends itself more to rotating crunches. It would be pretty hard to mimic a “standard” crunch with one arm, but the benefits of unilateral training (increased oblique load, improving each sides’ strength individually, checking/addressing imbalances, etc.) do still carryover somewhat when it comes to working abs.
But if the goal is to simply improve ab strength, I’d prioritize two-arm cable crunches, since you can use a heavier load, and maybe include one-arm crunches occasionally.
Yes. If you’re pulling with one arm, that means one side of your body is applying force and the other side is not. This requires more balancing and stabilizing.
Do a suitcase deadlift with dumbells in each hand.
Do the same but only carry a dumbell in one hand. [/quote]
The thing is, though, the stabilization effects of unilateral loading don’t really apply to trunk flexion exercises (like crunches) because you don’t want stabilization.
That said, one-arm dumbbell squats/deadlifts can be pretty brutal. For even more “fun”, try holding the dumbbell in one hand in the rack position (resting the thumbside on the front of the shoulder).