I'm pretty new to working out so bare with me. This guy the other day was doing pretty much all my exercises but with one arm (cable curls, preachers). Is this more beneficial? I'm assuming because you aren't getting help from the other arm? Also, he was doing cable curles, but his back to the weight, using one arm. More beneficial then regular cable curls, or do I implement this shit once I've been working out for like a year?