Advanced Leg Strength?

I'm curious about something.  The Foundation courses teach fundamental straight and bent arm strength, so the levers and manna and all that, and fundamental leg strength, or the single-leg squat.  Going beyond the fundamentals, you can use various ring exercises to get advanced upper body strength, but what would be considered advanced leg strength?  Are there any other exercises or apparatus that go beyond the SLS?  Or is advanced leg strength simply working with weights, squats and deadlifts and all that?

 

 

Advanced leg strength would fall into dynamic movements which will most likely be released with the movement series. Coach has also previously mentioned that weightlifting is also very good especially in combination with the dynamic gymnastic movements.

For advanced leg strength you might have to venture into heavy squatting and sprinting and long jump.