Seated Leg Extension Machine
Isolates all four quadriceps heads in their shortened position for teardrop definition.
3D Visual Form & Technique Demonstration
Biomechanically verified form execution and joint angle cues.
Adjust back pad so knees align directly with machine pivot point. Position shin pad just above ankles, grasp side handles.
- Primary Muscle: LEGS
- Secondary Synergists: Pure Isolation
- Rest Interval: 60 seconds between sets
Seated Leg Extension Machine Anatomy Activation
Primary motor unit recruitment for legs with secondary synergist stabilizers.
Step-by-Step Execution Guide
Adjust back pad so knees align directly with machine pivot point.
Position shin pad just above ankles, grasp side handles.
Extend legs upwards until knees are straight, squeezing quads hard at top.
Lower weight under control over 2-3 seconds.
Common Mistakes & Form Fixes
Kicking weight up using momentum.
Lifting hips off the seat.
Keep reps smooth and avoid ballistic kicking if having anterior knee irritation.
Alternative Exercises & Swaps
If the equipment is occupied or you need a joint-friendly variation, substitute with these approved movements:
