unilateral lower body exercises induce greater core activation than bilateral exercises. This is likely due to the inherent instability of the movement which will cause greater oblique activation in order to maintain torso position. Using lower body unilateral exercises can be a great strategy for training multiple muscle groups at once!
▪️ Source: Andersen, V., Fimland, M. S., Brennset, ., Haslestad, L. R., Lundteigen, M. S., Skalleberg, K., & Saeterbakken, A. H. (2014). Muscle activation and strength in squat and bulgarian squat on stable and unstable surface. International Journal of Sports Medicine, 35(14), 1196-1202.