Bonus Episode: Dr. Feigenbaum on Volume vs. Intensity, Training Frequency, Peptides, and More!

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Oct 9, 2025

Dr. Jordan Feigenbaum dives into the essentials of training volume, intensity, and their impact on muscle growth. He clarifies muscle memory, revealing that previously trained muscles bounce back faster due to lasting adaptations. The discussion covers the safety and effectiveness of popular peptides, alongside a look at the ‘Murph’ workout's risks and benefits. With tips on managing back pain and options for busy trainees, he also tackles the balance between cardio and muscle building—highlighting realistic training sessions and addressing chronic injuries.

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INSIGHT

Training Load Is The Master Variable

Training load (volume, intensity, proximity to failure) determines exercise adaptations the way energy balance determines weight change.
Volume mostly sets magnitude, while intensity/proximity shape the type of adaptation.

INSIGHT

Muscle Memory Speeds Muscle Regain

Muscle memory exists: previously trained muscles regain size and strength faster after detraining.
Myonuclei and persistent neuromuscular adaptations likely explain the faster regain though duration is uncertain.

ADVICE

Program Singles To Improve Max Efforts

Use singles to practice maximal single-rep performance and to learn how strong you are on a given day.
Place fatigue singles before, during, or after volume depending on goals and preference.

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