The foundational quad-focused sissy squat — knees track forward while the hips stay back, loading the quadriceps in deep flexion. The gateway exercise of the Hackenschmidt method.
Back-to-the-wall tibialis raise — lifting the front of the foot against resistance to strengthen the anterior shin, balancing the calf and protecting the knee from the outside in.
A Poliquin-style step-up with the foot on a slant board: drives the knee forward and over the toes to strengthen the vastus medialis and reinforce patellar tracking.