Beginner
Partial Leg Extension
Living in the top half of the leg extension keeps the quads under continuous tension and is a favorite way to extend a set once full-range reps run out. The peak-contraction focus is brutal on the vastus and rectus without much knee stress. Tack these on at the end of a quad session as a burnout.
- Equipment
- Machine
- Body part
- Quads
- Type
- Strength
- Browse by muscle
- Rectus Femoris, Vastus Lateralis
- Browse by movement
- Knee Extension
- Target
- Rectus Femoris, Vastus Lateralis
How to do it
- 1
Sit in the machine with the pad set on your shins and knees aligned to the pivot.
- 2
Extend both legs to the top, near full lockout.
- 3
Lower only about a third of the way down.
- 4
Drive back up to the top and squeeze the quads.
- 5
Repeat these short partial reps without pausing at the bottom.
- 6
Keep the reps rhythmic and controlled.
Tips
- Stay in the upper range where the quad contraction is strongest.
- Do not let the reps turn into a bounce.
- Use these after a set of full-range extensions for maximum effect.
Variations
Common mistakes
- Letting the range creep lower as you tire quietly turns partials into short full reps at a weight chosen for the top third. When you can no longer hold the top third, end the set.
- Loading the stack heavier because the reps are short pins the knee near lockout under weight it carries nowhere else. Keep the load close to what you use for full-range reps.
- Jamming into the machine's hard stop at the top, which now happens twice as often as in a normal set, makes the joint do the stopping. Finish each rep just short of the limit.
- Holding your breath through a burnout of twenty-plus short reps is a quick route to feeling faint. Keep a steady rhythm of breathing even though the reps come fast.
- Tacking partials onto every set of the session leaves the quads too fried for whatever follows. One or two burnout sets at the end is the whole dose.
Frequently asked
- How many partial leg extensions should a beginner do?
- Use them as a tail, not a main course. Finish your last full-range set, then keep going with 15 to 25 short reps in the top third until you can no longer hold the top position. One or two of those burnout sets per session is enough, at the same weight as the full-range set rather than heavier. Progress by tracking how many partials you manage each week; that number climbing is the whole measure. Once a week per leg session.
- What can I do instead of partial leg extensions if I have no machine?
- Every quad exercise has a top range you can live in. Try short pulses in the last third of a band leg extension seated on a table, the top few inches of a split squat, or a wall sit held at a shallow knee bend until the quads give out. None of them isolate the knee as cleanly as the machine, so expect the glutes and hips to take a share of the work, and judge the set by the burn rather than by a rep count.
- What are partial leg extensions for and when should I skip them?
- They are a burnout technique for quad size. Living in the top third keeps the quads contracted with no rest point, so they add stimulus to a set that has already run out of full reps. That suits lifters who want more quad volume without more heavy sets. Skip them when you have not done full-range work first, when your knees feel irritable near lockout, and when you are training for strength, because reps in the shortened range build very little that shows up in a squat.
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