I'm wondering about the change from single leg squats in F1+2 to lunges in F3. I know they're focusing on a single leg but there's a difference since ones supported (lunge) while other one isn't (SLS)
Is it because as weight gets heavier, it'll become troublesome for lower back since in SLS it's flexed under load while lunge has a neutral spine? Or is it a men's gymnastics reason?