Why twice a week
A 2016 meta-analysis by Schoenfeld, Ogborn and Krieger found that training a muscle at least twice a week produced more growth than once a week. A follow-up in 2019 found that when weekly volume is equal, frequency itself matters little. The practical reading: frequency is mostly a way to spread your volume so each set is done fresh.
That is why the old “bro split”, one muscle group per day and each once a week, is not wrong but makes life harder: all of a muscle’s weekly sets land in one tiring session.
The three common splits
- Full body, 2 to 3 days: every session trains the whole body. Forgiving when you miss a day, and the best start for beginners.
- Upper/lower, 4 days: two upper-body and two lower-body sessions. Shorter sessions than full body, at the same frequency.
- Push pull legs, 3 or 6 days: pushing muscles, pulling muscles, then legs. Run once through the week it trains each muscle once; run twice through, it needs six days in the gym.
Choose honestly
Start from your calendar, not from what the strongest person in your gym does. A three-day plan you complete every week beats a six-day plan you finish two weeks out of four.
A missed day costs different amounts per split. Skip a full-body session and you lose a third of the week, but every muscle was still trained. Skip leg day on push pull legs and your legs get nothing that week.
Session length matters too. With 45 minutes to spare, a split that spreads the work over more days fits better than one that packs everything into three long sessions.
Let the plan follow your week
Luca, the AI coach in PushBeyond, builds a plan around the days per week, session length, equipment and experience you give it, so the split follows your week rather than the other way round.