Step by step instructions, muscle activation and variants for the Seated Leg Extension.
A machine-based isolation exercise that extends the knee against a padded lever arm to target the quadriceps with minimal involvement from other muscle groups. The seated position keeps the hip flexors shortened, making it particularly effective for achieving a strong peak contraction at full extension.
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The Seated Leg Extension is a foundational movement that builds strength and muscle through controlled, progressive overload. Train it 1 to 2 times per week with 3 to 5 working sets per session, gradually adding weight or reps as form holds up.