Well, there are "magic bullets"...a few months of pull-downs did nothing for my back, while a few months of chins added around 3" of back and 1" of biceps. (as Bret C's studies have shown, the chins activate 2-4 times more of everything compared to pull-downs, so this is easy to explain)
High rep squats/deadlifts are also "magic bullets". GOMAD is also a "magic bullet".
But, this, if you understand "magic bullet" as something VERY effective, at least compared to bullsheet muscle-rag routines. If by magic bullet one understands "1 minute biceps, chest and abs", though...that's a whole nother animal...
Well, I just lift quick, and no longer strain to keep my body uber-stiff (except DL, squat, 1A Push-ups, and a few other). I don't swing, just "skip" the first (some) degrees of flexion and strictly curl after that, and I could row (albeit for less reps) what I "Kroc" (actually, I twist/heave less than mr. Krok. Not that there's anything wrong with that)
(frame rate in this one^ sucks due to night mode; tempo is ~same as in the next)