Turning 40 isn't a signal to slow down—it's your cue to train smarter. Your recovery capacity, hormone profile, and joint health shift, but your ability to build strength and muscle remains robust. The key lies in choosing the right structure. Enter the 4-day upper/lower split: the gold standard for the experienced lifter over 40.

This split offers the perfect balance between training frequency, volume, and recovery. It allows you to hit each muscle group twice a week—the sweet spot for hypertrophy—while giving your central nervous system and joints ample time to bounce back. In this guide, we'll break down the best 4-day strength training split, explain why it works, and give you a concrete plan to follow.

Why a 4-Day Split Works Wonders After 40

After 40, your body responds differently to training stress. Testosterone levels naturally decline, protein synthesis becomes slightly less efficient, and recovery takes longer. A 4-day split addresses these changes head-on:

  • Optimal frequency: Hitting each muscle group twice a week maximizes muscle protein synthesis (MPS) without overwhelming recovery.
  • Strategic rest: With three rest days, you give your joints, tendons, and nervous system the downtime they crave.
  • Volume control: You can manage total weekly sets to avoid systemic fatigue while still providing enough stimulus for growth.

This approach also aligns perfectly with the principles of Strength Training for Men Over 40: Vitality, Testosterone, and Power, focusing on compound lifts and progressive overload.

The Best 4-Day Split: Upper/Lower (A/B) Layout

Here's the classic upper/lower split, optimized for the over-40 lifter. You'll perform two upper-body days (one strength-focused, one hypertrophy-focused) and two lower-body days (one squat-focused, one hinge-focused). This ensures balanced development and reduces the risk of overuse injuries.

Day 1: Upper Body – Strength Focus

  • Barbell Bench Press: 4 sets x 5 reps (heavy)
  • Weighted Pull-Ups: 4 sets x 6 reps (or Lat Pulldown)
  • Seated Dumbbell Shoulder Press: 3 sets x 8 reps
  • Barbell Rows: 3 sets x 8 reps
  • Incline Dumbbell Curls: 2 sets x 12 reps
  • Triceps Pushdowns: 2 sets x 12 reps

Day 2: Lower Body – Squat Focus

  • Barbell Back Squat: 4 sets x 5 reps (heavy)
  • Romanian Deadlifts: 3 sets x 8 reps
  • Walking Lunges: 3 sets x 10 reps per leg
  • Leg Press: 3 sets x 12 reps
  • Calf Raises: 4 sets x 15 reps

Day 3: Rest or Active Recovery

Day 4: Upper Body – Hypertrophy Focus

  • Incline Barbell Press: 4 sets x 8 reps
  • Chest-Supported Row: 4 sets x 10 reps
  • Arnold Press: 3 sets x 10 reps
  • Lat Pulldown (wide grip): 3 sets x 12 reps
  • Face Pulls: 3 sets x 15 reps
  • Hammer Curls: 2 sets x 12 reps
  • Overhead Triceps Extensions: 2 sets x 12 reps

Day 5: Lower Body – Hinge Focus

  • Conventional Deadlift: 4 sets x 5 reps (heavy)
  • Front Squat (or Goblet Squat): 3 sets x 8 reps
  • Hip Thrusts: 3 sets x 10 reps
  • Leg Curls: 3 sets x 12 reps
  • Standing Calf Raises: 4 sets x 15 reps

Rest Days: Day 6 and Day 7

Use these days for active recovery: walking, mobility work, or light stretching. Avoid intense cardio that could interfere with your lifting recovery.

Key Principles for Lifters Over 40

1. Prioritize Form Over Ego

Your joints are less forgiving than they were in your 20s. Perfect your technique on compound lifts before loading up the bar. Poor form is one of the most common 5 Injury-Causing Strength Workout Mistakes (And How to Fix Them), so video yourself or work with a coach to ensure every rep is clean.

2. Warm Up Like It's Your Job

A proper warm-up is non-negotiable. Spend 5-10 minutes on dynamic stretches, light cardio, and mobility drills. Then perform 2-3 ramp-up sets of the first exercise, gradually increasing weight. This primes your nervous system and lubricates the joints.

Pro Tip: Before heavy squats or deadlifts, do 10-15 minutes of light cycling or rowing to raise your core temperature. Then follow with leg swings, hip circles, and bodyweight squats to activate the glutes and hips.

3. Manage Your Volume and Intensity

Total weekly sets per muscle group should stay in the 10-15 range. Keep your main lifts in the 3-5 rep range for strength, and your accessory work in the 8-15 rep range for hypertrophy. Leave 1-2 reps in reserve (RIR) on most sets to avoid grinding to failure, which spikes cortisol and impairs recovery.

4. Don't Skip Cardio or Zone 2 Work

Strength training is only half the equation. To improve your heart health and metabolic rate, incorporate 2-3 sessions of Zone 2 cardio (e.g., brisk walking, cycling) and one HIIT session per week. For a deep dive into cardio selection, check out our guide on Zone 2 Cardio vs. HIIT: Which One Actually Burns Belly Fat Faster?. Remember, your heart is a muscle too.

5. Fuel Your Body with Protein

Muscle protein synthesis becomes less efficient with age, so you need more protein to maintain and build muscle. Aim for 1.6-2.2 grams of protein per kilogram of body weight daily. This is a cornerstone of the benefit of protein for man over 40 YEARS. Spread your intake across 4-5 meals, with 30-40 grams per meal. For more details, read our guide on protein needs after 40.

6. Prioritize Sleep and Stress Management

Sleep is when your body releases growth hormone and repairs muscle tissue. Aim for 7-9 hours of quality sleep per night. Manage stress through meditation, deep breathing, or even just a 10-minute walk. Chronic stress elevates cortisol, which breaks down muscle and stores belly fat.

How to Progress Safely

Progressive overload is essential, but it must be gradual. Add weight only when you can hit the top of the rep range with perfect form. Increase by 2.5-5 pounds on upper-body lifts and 5-10 pounds on lower-body lifts. Every 4-6 weeks, take a deload week where you drop the weight by 40-50% to let your joints and nervous system fully recover.

Adjusting for Your Goals

  • Strength: Focus on the 3-5 rep range for main lifts, and keep accessory work moderate. Increase rest periods to 3-5 minutes.
  • Hypertrophy: Use 8-12 reps for most sets, and rest 60-90 seconds. Add drop sets or supersets occasionally.
  • Fat Loss: Maintain your strength work, but add more Zone 2 cardio and tighten your diet. Keep protein high to preserve muscle.

The Importance of VO2 Max

As you age, your VO2 max—the maximum amount of oxygen your body can use—becomes a critical predictor of longevity. Strength training alone won't boost it enough. You need dedicated cardio sessions. To learn how to test and improve yours, read our article on VO2 Max Is the Single Best Predictor of Lifespan: How to Test and Improve Yours. This will help you design a cardio plan that complements your lifting.

Sample Weekly Schedule

  • Monday: Upper Strength
  • Tuesday: Lower Strength
  • Wednesday: Active Recovery (Zone 2 cardio + mobility)
  • Thursday: Upper Hypertrophy
  • Friday: Lower Hypertrophy
  • Saturday: HIIT or fun activity (sports, hiking)
  • Sunday: Full rest

Conclusion

A 4-day upper/lower split is arguably the best strength training template for lifters over 40. It provides the right balance of frequency, volume, and recovery to build muscle and strength safely. Combine it with proper protein intake, adequate sleep, and smart cardio, and you'll be amazed at what your body can still achieve.

Start with the plan above, listen to your body, and adjust as needed. Consistency beats intensity every time. Your 40s can be your strongest decade yet—if you train smart.

Ready to take the next step? Explore our [10 Daily Habits that Build Long-Term Physical and Mental Strength](/10-daily-habits-build-physical-mental-strength-after-40/) to complement your new routine.