Here’s how to work all 4 parts of the quadriceps (rectus femoris, Vastus lateralis, Vastus medialis, and Vastus intermedialis) with the leg extension machine!
The big key is lining up the line of action of the muscle you want to focus on, with the machine/extension of the lower leg. To do this, you will be pointing your toes in different directions to focus on different parts of the quads:
1) Toes Out = Vastus Medialis
2) Toes Forward = Rectus Femoris and Vastus Intermedialis
3) Toes In = Vastus Lateralis
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