This plan alternates between training the left and right side of your body using only unilateral movements. So instead of U/L/U/L/U/L/R as in an upper/lower split, you have L/R/L/R/L/R/rest. There is no scientific basis for this approach. Nothing about it has any reason to be superior to existing methods of structuring workouts. There is a good chance you will over time develop some form of muscular imbalance due to uneven fatigue management. But what if… what if a left/right split was secretly the most hypertrophic approach to lifting, and you missed out on a groundbreaking discovery simply because you were scared of spending 8 weeks doing unoptimal training. Food for thought.