How Often Should You Actually Train Each Muscle Group?

What the research increasingly points to

Training each muscle group at least twice a week tends to produce better muscle growth than the traditional once-a-week 'bro split,' primarily because it allows for more effective weekly volume distributed with better recovery in between.

Why once-a-week sessions became popular anyway

They're simple to plan and allow a genuinely brutal, high-volume session for one muscle group. It's not that this doesn't work at all — it's just generally less efficient than spreading the same volume across two sessions.

A practical example structure

A push/pull/legs split repeated twice in a week, or a full-body routine done three times a week, both naturally hit each muscle group with the recommended frequency without needing a complicated schedule.

What matters more than the exact frequency

Total weekly volume and consistent progressive overload matter more than whether you technically hit a muscle group once, twice, or three times — frequency is a tool for fitting in enough volume, not a goal in itself.