Hypertrophy Past and Present 045 Training a muscle 2x per week - Full Body vs Upper/Lower
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Mar 30, 2026 They compare full-body twice weekly versus an upper/lower four-times plan and why frequency matters more than you think. A classic 1960s two-way program is dissected for useful lessons. They discuss within-session fatigue, post-workout CNS suppression from consecutive days, and how session length and volume trade off rate of growth versus long-term ceiling. Practical schedule and lifestyle factors are considered.
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Chuck Sipes Classic Four Day Upper Lower Example
- Jake presents a late-1960s Chuck Sipes four-day upper/lower program with squats, deadlifts, rows and bench press repeated twice weekly.
- He highlights breathing-rest squats, descending bench sets, cheating curls, and abs for two sets of 20.
Repeat Exercises Twice Weekly To Avoid Maintenance
- Repeating the same exercises twice per week (not varying across sessions) preserves progress; changing exercises across sessions risks only maintaining previously trained fibers.
- Maintenance literature shows single exercises once weekly mostly produce maintenance, not growth for unique fibers.
Within Session Fatigue Harms Later Exercises
- Full body twice weekly sessions concentrate more work into each session, causing within-session fatigue that reduces motor unit recruitment for later exercises.
- Upper/lower four-day splits spread volume, so each session is shorter and avoids end-of-session recruitment loss but introduce other fatigue carryover between days.