If you're going to max out your lifting (6-8 reps) you have to ensure that you equally work the counter muscle. So if you are maxing out bench you have to max out the rear delts and traps or you'll encounter injury and impingement as a result of one muscle pulling the joints out of their natural alignment. Then you'll be lifting a lot of weight while a joint is out of place and placing a lot of strain on the nerves, ligaments and tendons which hurts like a sonofabitch.
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