11/02/2026
Arm growth is driven by motor unit recruitment, not just volume.
The biceps and triceps grow when high-threshold motor units are recruited and exposed to sufficient mechanical tension.
That only happens when sets are taken close enough to failure.
If you stop 4–5 reps short because it burns, you’re mostly stimulating lower-threshold fibres.
To maximise hypertrophy in the arms:
• Train within 0–2 reps of failure
• Use controlled eccentrics
• Keep movements stable to maintain tension
• Accumulate 10–16 hard sets per week per muscle group
• Progress load or reps over time
Momentum reduces tension.
Excess fatigue reduces performance.
Effective arm training is about managing stimulus and recovery — not just chasing a pump.
If you want more breakdowns on how muscle actually grows, follow the page
