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When using a leg press machine for reps, what should the range of motion be? And specifically, should I lock out my knees or not?

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No, the knees should not be locked out.* See caveat.

The two primary reasons:

  1. Once the knees are locked all the weight is transferred directly to the joint, which can be disasterous
  2. Not locking out increases the time under tension.

* Caveat

With appropriate loading and a controlled lift the risk of injury is relatively low.

There's two aspects: the joint load itself, and the "snap" into the locked position. The "snap" may introduce a dynamic load to the joint, while the joint load is a static stress.

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  • I'll mark as accepted but if you're able to expand on the full range of motion (ie how far back to go) even better. Thanks for your answer.
    – Mr. Boy
    Oct 18 at 8:50

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