In this screenshot from his video, Scott Herman hyper-extends his right arm, essentially resting. He has released the stress on his right biceps, thus taking them out of the equation. He needs to keep a bend in his right elbow at this stage to maintain the flex in the biceps, which will reduce the stress on his right elbow substantially as he powers up for the next rep.
Hyper-Extending is both useless and dangerous.
A muscle can stretch or extend only so far. Going beyond that point is called HYPER-EXTENDING. Hyperextending adds NOTHING to the result—except a world of hurt.
I see guys doing barbell biceps curls on a preacher bench, or going below parallel on dumbbell chest presses for example, in which enormous stress is placed on the joints to accomplish their hyper-extending. Not only does the target muscle not receive any additional benefit from hyper-extending, but quite the opposite, since the flex and concentration on the target muscle must be released/disengaged in order to accomplish a hyper-extension, thus transferring the stress from the muscle you are trying to enlarge to your fragile joints.
And for those who claim their joints are "just fine, thank you": tick-tock.
But hey, what do I know? I’ve just been working out for 58 years and still going strong—and I can guarantee that those of you who are big fans of the hyper-extension sure as hell won’t be.
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