Is "muscle confusion" just bro science, or does recent strength training research actually back it up? You might be surprised...

We get into how muscles grow, why exercise selection changes which regions of a muscle develop, and the role of muscle length in hypertrophy.

This episode covers the last decade of research on exercise variation and hypertrophy. These include studies on leg press vs. leg extension and on triceps and hamstrings at different muscle lengths.

We distinguish the original P90X version of "muscle confusion" from the systematic variation (aka periodization and mesocycles) that you can intentionally plan into your strength training programming.

This framing matters most for adults over 40 who've been told to pick a few compound lifts and add weight to the bar forever (sound familiar?).

Join Eat More Lift Heavy, the 26-week coached program where adults over 40 build the nutrition and training skills to preserve muscle, lose fat, and manage their physique for life.

Timestamps:

0:00 - Muscle confusion and exercise variation
2:25 - Where "muscle confusion" came from
4:00 - Mechanical tension and progressive overload
5:52 - Muscles as regional structures
7:30 - Regional hypertrophy in the quads
10:24 - Muscle length and hypertrophy
14:30 - Strategic exercise selection
15:45 - Training programming for adults over 40
17:01 - 3 rules for planned variation
20:42 - Caveats on variation
23:35 - Bonus: lengthened-position swap per muscle group

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