What is a 5 day split?
One body part a day for five days: chest, back, shoulders, arms, legs, then two rest days. Each muscle is trained hard, directly, once a week. Chest day also works your triceps and back day your biceps, so the arms get extra work.
Is a 5 day split worse than full body?
Not when the weekly sets are equal: in a meta-analysis of 14 studies (392 people), split and full-body routines gave the same strength and muscle gains [Ramos-Campo et al. 2024]. But one study in trained men found that training each muscle 3 times a week grew the arms more than a split [Schoenfeld et al. 2015], and an earlier meta-analysis favoured twice a week over once [Schoenfeld et al. 2016]. The split works as long as you do all the sets and never skip a day.
Who should not do a 5 day split?
People whose schedule changes a lot: with a split, a missed day means that muscle waits two weeks. Take the Upper / Lower plan instead. If you have pain or an injury, see a doctor or physical therapist first.
What if I miss a day?
Keep the order and do the missed session on Saturday rather than skipping it.
How long are the sessions?
Chest, shoulders and arms take 45–55 minutes, back 55–65 minutes and legs 65–75 minutes, rest between sets included.
Can I do this program at home?
Yes. Every exercise has a home version that needs a backpack you can load with books or water bottles, two resistance bands, a doorway pull-up bar, a sturdy chair and a step. For example, push-ups replace the bench press and Nordic curls replace the leg curl machine.
What does RIR mean?
Reps in reserve: how many more clean reps you could still do when you stop the set. RIR 1–2 means you stop when you feel you have 1 or 2 reps left. In one 8-week study, stopping 1–2 reps short of failure grew the quads as much as going to failure [Refalo et al. 2024].