The Science of Building Core Strength

If I told you right now that we wanted to get your quad stronger and I'll keep coming back to this parallel and you said "Yes I want to maximize my muscle size in my quad. I want the biggest quads ever" or "I want to break a world record in leg extension strength" or something and I said "Awesome we're going to do wall squats. " You'd be like "What? " Not saying you can't do them but if that's your only approach you're going to be very hard to convince any athlete or coach that is the best way. That's the same thing you're doing with your abs when all you're doing are planks and three sets of 20 crunches. You're forgetting the size principle which is huge numbers of your motor units are not being activated. When they're not activated you don't actually get stronger. You get better endurance but you don't get them stronger. The equivalent here exchange would be "Yeah sure do your wall squats where you're holding that 45-degree position against the wall and then also add in some leg presses or leg extensions or whatever leg exercise you like right fatigue and burning are not the same as force production. There's an overlap of course but you see the major difference here.