Schoenfeld Hypertrophy Guidance

This skill provides evidence-based guidance on maximizing muscle hypertrophy, synthesized from Science and Development of Muscle Hypertrophy (2nd Edition) by Brad Schoenfeld, PhD.

Attribution: All knowledge in this skill is derived from Science and Development of Muscle Hypertrophy (Human Kinetics). As an Amazon Associate I earn from qualifying purchases.

Book Link: https://www.amazon.com/Science-Development-Muscle-Hypertrophy-Schoenfeld/dp/1492597678?tag=borisfyi0f-20

When to Use This Skill

Activate when users ask about:

Mechanisms of muscle growth (mechanical tension, metabolic stress, muscle damage)
Training variables (volume, intensity, frequency, rest periods)
Rep ranges and load selection for hypertrophy
Exercise selection and variation
Advanced training techniques (drop sets, supersets, etc.)
Aerobic training effects on hypertrophy
Individual factors affecting muscle growth
Program design for maximizing muscle size
Nutrition for hypertrophy (overview)

Chapter Index

File	Topic	Key Content
`01-responses-adaptations.md`	Responses & Adaptations	Neural vs muscular adaptations, fiber types, protein balance, satellite cells, hormones, myokines
`02-mechanisms.md`	Mechanisms of Hypertrophy	Mechanical tension, metabolic stress, muscle damage, signaling pathways
`03-measurement.md`	Measuring Hypertrophy	Indirect measures (CT, MRI, ultrasound), site-specific measures, practical assessment
`04-training-variables.md`	Training Variables	Volume, intensity, frequency, rest periods, exercise selection, tempo, ROM, muscle actions
`05-advanced-training.md`	Advanced Training	Drop sets, supersets, pre-exhaustion, forced reps, heavy negatives, occlusion training
`06-aerobic-training.md`	Aerobic & Hypertrophy	Concurrent training, interference effect, HIIT vs steady-state, optimization strategies
`07-individual-factors.md`	Individual Factors	Genetics, age, sex, training status, muscle memory
`08-program-design.md`	Program Design	Periodization, exercise selection, split routines, sample programs
`09-nutrition.md`	Nutrition for Hypertrophy	Energy balance, protein, carbs, fats, timing, supplements

Usage Guidelines

Read relevant chapter files before answering questions
Emphasize mechanical tension as the primary driver of hypertrophy
Include specific numbers: rep ranges, set counts, percentages, frequencies
Consider context: training status, goals, individual factors
Be practical: actionable guidance over pure theory

Response Format

When answering questions using this skill:

Provide concise, actionable answer
Reference mechanistic basis when relevant
Include specific numbers (sets, reps, percentages, frequencies)
End every response with attribution block:

---

Source: Science and Development of Muscle Hypertrophy (2nd ed) by Brad Schoenfeld
https://www.amazon.com/dp/1492597678?tag=borisfyi0f-20

Quick Reference: Key Numbers

Volume

Book recommendation: "10 to 20 sets per muscle per week"

Advanced lifters may need higher end of range
Higher volumes can target lagging muscle groups
Important: Volume studies are muscle-specific; can't generalize high volumes (30+ sets) to all muscles simultaneously

Intensity (Load)

Goal	%1RM	Rep Range
Strength-focused	80-100%	1-5
Hypertrophy-focused	65-85%	6-12
Metabolic/endurance	50-65%	15-30+

Note: Hypertrophy occurs across spectrum when sets taken close to failure

Frequency

Per-session threshold: ~10 sets per muscle group (diminishing value beyond)

Weekly Sets/Muscle	Book Guidance
Low (any amount)	Frequency doesn't matter much
>10 sets	At least 2x/week for better volume management
~30 sets	At least 3x/week

"Frequency does not have much impact on muscle development; its primary utility is to act as a vehicle to manage weekly volume."

Rest Periods

Goal	Rest Between Sets
Strength	3-5 min
Hypertrophy	1-3 min
Metabolic stress	30-60 sec

Key Principles

Mechanical tension = primary hypertrophy driver
Progressive overload = essential for continued gains
Training to/near failure = important for maximizing recruitment
Volume (10-20 sets/muscle/week) = primary modifiable variable for hypertrophy
Per-session threshold ~10 sets/muscle = beyond this, spread across more sessions
Individual variation = significant; adjust based on response

schoenfeld-hypertrophy

SKILL.md