Q: I’ve added a lot of muscle using Pre-Ex 3X and modified pre-ex. I must commend you for coming up with it. One problem I have is with leg extensions. They hurt my knees when I do them first. Funny that squats don’t hurt me. Leg extensions are the only quad isolator. What should I do first instead?

A: We didn’t come up with pre-exhaustion. That honor goes to the late Bob Kennedy, publisher of MuscleMag…

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