In terms of firming up, what really matters is that you are genuinely challenging your muscles.
Many so-called "strength training" videos use weights that are far too light, because they need to allow for multiple re-takes, and also want to demonstrate perfect form.
Also, many people following exercise videos want to "keep up" with the number of reps done by the instructor, and use a lighter weight to do so.
But in reality, firming up muscle depends on genuinely challenging your muscles at close to their maximum capacity. This means using a heavy weight, that fatigues your muscles in just a few reps. A weight that fatigues your muscles in 4-6 reps is actually far more effective than doing 12-20 reps with a lighter weight. Don't feel compelled to "keep up" with the video.
What weight you use is YOUR choice, and certainly with the appropriate weight, Jillian Michaels videos can certainly be effective.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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