A four-day upper/lower split is a resistance training schedule that divides workouts into upper-body and lower-body sessions, typically performed on alternating days. For lean adults who are new to structured strength training, this approach can provide a manageable way to train each major muscle group twice per week while allowing enough recovery between sessions.

Short version: Train four days a week with two upper and two lower sessions, using compound exercises and a moderate rep range to build a foundation of strength and muscle.

Why Frequency Matters for Muscle Growth

How often you train a muscle group can influence how much it grows. A 2016 meta-analysis by Schoenfeld, Ogborn, and Krieger examined resistance training frequency and hypertrophy. The researchers found that when total training volume was equated, training a muscle group twice per week produced greater hypertrophic outcomes than training it once per week. The abstract states that “the current body of evidence indicates that frequencies of training twice a week promote superior hypertrophic outcomes to once a week.” Whether three times per week is superior remains undetermined.

Volume also plays a role. A 2017 meta-analysis by the same group reported a graded dose-response relationship between weekly resistance training volume and muscle hypertrophy. According to the abstract, each additional set was associated with a small increase in effect size, and higher-volume protocols generally produced larger gains. This suggests that spreading a sufficient number of weekly sets across two sessions per muscle group can be an effective strategy.

The American College of Sports Medicine’s 2009 position stand offers frequency guidelines based on training experience. For novice lifters, it recommends 2-3 days per week. For intermediate lifters, it recommends 3-4 days per week, and for advanced lifters, 4-5 days per week. A four-day split fits well for someone moving beyond the earliest beginner phase, as it aligns with ACSM’s intermediate frequency range while still being manageable. The ACE Strength Training 101 fact sheet adds a practical rest rule: aim to exercise each muscle group at least two times per week, with a minimum of two days of rest between workouts for the same muscle group. This spacing helps tissues recover and adapt.

Building Your Four-Day Upper/Lower Template

One way to set up the week so that each muscle group gets at least two days of rest between sessions:

  • Monday: Upper Body
  • Tuesday: Lower Body
  • Wednesday: Rest
  • Thursday: Upper Body
  • Friday: Lower Body
  • Saturday: Rest
  • Sunday: Rest

This layout ensures at least two full days between sessions that target the same muscle groups, as ACE recommends. You can adjust the days to fit your schedule, as long as the rest rule is respected.

Exercise Selection

ACE’s Strength Training 101 lists a core curriculum of exercises that cover all major muscle groups: leg press, leg curl, chest press, lat pull down, lateral raise, triceps press, biceps curl, curl-up, and back extension. A balanced upper-body session might include a chest press, a lat pull down, a lateral raise, a triceps press, and a biceps curl. A lower-body session could include a leg press or goblet squat, a leg curl, and a back extension.

The ACE Exercise Library provides step-by-step instructions for many movements. For the dumbbell chest press, you lie supine on a flat bench, depress and retract your scapulae, and lower the dumbbells toward your mid-chest with a controlled motion. Keep your wrists neutral and avoid arching your low back. Press the dumbbells back up to full elbow extension. For the goblet squat, stand with feet about shoulder-width apart, hold a dumbbell vertically in front of your chest, and lower your body until your hips are below your knees. Push through your feet to return to standing. Full steps are in ACE’s exercise library.

Sets, Reps, and Load

ACE’s Strength Training 101 states that one set of 8-12 repetitions, working the muscle to the point of fatigue, is usually sufficient for beginners. When you can complete 12 repetitions with good form, increase the resistance by 5 to 10 percent to continue making progress. The ACSM position stand recommends that novice lifters use loads corresponding to an 8-12 repetition maximum. For hypertrophy-focused training, ACSM suggests loads in the 6-12 repetition maximum zone, with 1- to 2-minute rest periods between sets. As you gain experience, you can gradually add sets while staying within a volume that allows recovery.

Progression is essential. ACSM advises increasing the load by 2-10% when you can perform one to two repetitions over the desired number. Combining this with ACE’s 5-10% guideline gives you a practical range to apply. Track your lifts so you know when to add weight. For more on this, see our article on progressive overload.

Recovery, Nutrition, and Consistency

Muscle tissue repairs and grows between sessions, not during them. ACE notes that training a muscle group more frequently or adding more sets may lead to slightly greater gains, but the extra benefit may not be worth the added time and injury risk. Respecting rest days is therefore a key part of the program. Our rest and recovery page covers rest days, soreness and sleep.

Food provides the building blocks for muscle. Lean individuals who struggle to gain weight often need to pay close attention to total energy intake and protein. While specific calorie needs vary, a slight surplus and adequate protein are commonly discussed in the context of muscle gain. For personalized guidance, consult a registered dietitian. You can learn more about the principles in our calorie intake and protein basics articles. Whole foods should be the foundation; no supplement can replace a well-planned diet.

Anyone with a medical condition, a history of injury, an eating disorder, or who is underweight should speak with a doctor or registered dietitian before starting a new training and nutrition program.

Getting Started Checklist

  • Choose four training days that give each muscle group two days of rest, for example upper on Monday and Thursday, lower on Tuesday and Friday.
  • Split the ACE core curriculum exercises between upper and lower days so every major muscle group is covered.
  • Start with one set of 8-12 repetitions per exercise, using a weight that challenges you by the last rep.
  • Rest at least two days between sessions that target the same muscle group.
  • Increase weight by 5-10% when you can complete 12 reps with good form.
  • Prioritize whole foods, adequate protein, and consistent sleep.

Frequently asked questions

How many sets and reps should a lean beginner use?

ACE’s Strength Training 101 suggests starting with one set of 8-12 repetitions to the point of fatigue. The ACSM position stand recommends loads in the 8-12 repetition maximum range for novices and notes that 6-12 RM with 1-2 minutes rest is appropriate for hypertrophy. As you adapt, you can gradually add sets while monitoring recovery.

Can I do this split with only dumbbells at home?

Many exercises from the ACE core curriculum can be performed with dumbbells and a bench. The chest press and goblet squat, for example, require only dumbbells. For more ideas, visit our home muscle building page.

How long should I rest between sets?

The ACSM position stand recommends 1- to 2-minute rest intervals for hypertrophy-focused training.

For more structured four-day plans, explore our Four-Day Programs category. You can also browse the full Workout Programs section or the beginner-focused Muscle Building Workout Plan for Beginners article.

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