Maximize Your Fitness Gains: Benefits and Strategies for Double Training Days

Double Training Days: How to Order Cardio and Weights for Best Results

Double training days are becoming a normal part of many fitness routines. This is when you do two workouts in one day—usually one cardio session and one strength session.

If you've ever wondered whether to run before or after lifting, or how to fit both into a busy day without hurting your progress, this guide is for you.

We'll break down what science says about double training days, how to order your workouts, and how to avoid common mistakes like running too hard right after leg day.

By the end, you'll have a clear, simple plan for structuring your own concurrent training schedule.

What Are Double Training Days?

A double training day is any day where you complete two separate workouts. Most often, this means:

• One cardio or endurance session (running, cycling, rowing)
• One strength or resistance session (weightlifting)

This is a specific way of doing concurrent training—a method where endurance and strength training happen within the same program, sometimes even the same day.
(source: https://pmc.ncbi.nlm.nih.gov/articles/PMC11688070/, https://pmc.ncbi.nlm.nih.gov/articles/PMC5407958/)

Why Double Training Days Are Growing in Popularity

More people are choosing double sessions because they want results fast, but don't always have flexible schedules.

• Busy professionals, hybrid athletes, and everyday gym-goers want to build strength and improve their cardio at the same time.
• Research shows concurrent training can be programmed well for most people—especially when sessions are spaced out properly and total workload is managed.
  (source: https://pmc.ncbi.nlm.nih.gov/articles/PMC11688070/, https://www.barbellmedicine.com/blog/concurrent-training-and-the-interference-effect/, https://www.thewholehealthpractice.com/post/concurrent-training-for-strength-and-cardio-how-to-avoid-the-interference-effect)

The real question isn't whether you should combine cardio and weights—it's how to do it. That means figuring out:

• Whether cardio before or after weights works best for your goals
• Whether to do both back-to-back or space them apart by hours
• How to handle specific situations like running after leg day or lifting after running

Understanding the Basics of Concurrent Training

What Is Concurrent Training?

Concurrent training simply means combining endurance training (like running or cycling) with resistance training (like lifting weights) in the same overall program.

This can happen:

• In the same session (weights then cardio, or vice versa)
• On the same day, but as separate sessions (morning run, evening lift)
• On different days within the same training week
  (source: https://pmc.ncbi.nlm.nih.gov/articles/PMC5407958/, https://www.barbellmedicine.com/blog/concurrent-training-and-the-interference-effect/)

The Interference Effect

Here's the tricky part. Studies have found that mixing cardio and strength training can sometimes reduce your strength, power, or muscle growth compared to doing strength training alone. This is called the interference effect.
(source: https://pmc.ncbi.nlm.nih.gov/articles/PMC5407958/, https://pmc.ncbi.nlm.nih.gov/articles/PMC7224562/, https://www.intutraining.com/the-interference-effect-what-is-it-and-do-i-need-to-worry/)

What research generally shows:

• Reduced strength and muscle gains happen more often when cardio and lifting are done on the same day or in the same session—especially for lower-body muscles and explosive movements.
  (source: https://body-data.jp/en/studies/concurrent-training-interference-meta, https://pmc.ncbi.nlm.nih.gov/articles/PMC5407958/)
• Less interference occurs when cardio and strength are separated by 24 hours or more.
  (source: https://pmc.ncbi.nlm.nih.gov/articles/PMC11688070/, https://blog.gymstreak.com/how-to-minimize-cardio-and-strength-training-interference/)

The Good News: Interference Is Often Small

A major review (Schumann et al., 2022) found that combining aerobic and strength training did not meaningfully hurt muscle growth or max strength for most people.
(source: https://www.thewholehealthpractice.com/post/concurrent-training-for-strength-and-cardio-how-to-avoid-the-interference-effect, https://www.barbellmedicine.com/blog/concurrent-training-and-the-interference-effect/)

Where interference shows up more clearly:

• Explosive power and fast, high-velocity movements
  (source: https://www.thewholehealthpractice.com/post/concurrent-training-for-strength-and-cardio-how-to-avoid-the-interference-effect, https://pmc.ncbi.nlm.nih.gov/articles/PMC11688070/)
• When fatigue isn't managed well—too much volume, not enough rest, heavy cardio right before heavy lifting
  (source: https://pmc.ncbi.nlm.nih.gov/articles/PMC5407958/, https://www.barbellmedicine.com/blog/concurrent-training-and-the-interference-effect/)

Benefits of Combining Cardio and Strength

• Saves time: You get more done in a busy schedule.
  (source: https://pmc.ncbi.nlm.nih.gov/articles/PMC11688070/, https://www.barbellmedicine.com/blog/concurrent-training-and-the-interference-effect/)
• Builds complete fitness: You improve your heart health, muscles, and body composition at once.
  (source: https://theconversation.com/training-cardio-and-weights-during-the-same-workout-probably-wont-hurt-your-gains-heres-why-187290, https://www.barbellmedicine.com/blog/concurrent-training-and-the-interference-effect/)
• Necessary for many athletes: Team sport athletes and endurance athletes who lift often need both.

Challenges to Watch For

• Fatigue and recovery: Doing both close together can pile up tiredness and slow your progress.
  (source: https://pmc.ncbi.nlm.nih.gov/articles/PMC11688070/, https://pmc.ncbi.nlm.nih.gov/articles/PMC5407958/)
• Harder planning: Balancing two training systems takes more thought than just lifting or just running.
• Lower-body interference: Running and lower-body lifting combined too closely cause the most muscle and power interference.
  (source: https://body-data.jp/en/studies/concurrent-training-interference-meta, https://theconversation.com/training-cardio-and-weights-during-the-same-workout-probably-wont-hurt-your-gains-heres-why-187290)

Cardio Before or After Weights? Determining the Best Order

This is one of the most common questions in fitness. Should you run first, or lift first?

The Traditional Advice

• Coaches have long suggested lifting first, then doing cardio, so you're not too tired for your heavy lifts.
  (source: https://www.intutraining.com/the-interference-effect-what-is-it-and-do-i-need-to-worry/, https://www.forgebiology.com/2025/10/11/should-you-do-cardio-before-or-after-lifting-evidence-based-guide/)
• Endurance athletes often flip this, doing cardio first to keep their key aerobic sessions high quality.
  (source: https://pmc.ncbi.nlm.nih.gov/articles/PMC11688070/, https://www.barbellmedicine.com/blog/concurrent-training-and-the-interference-effect/)

What the Research Actually Shows

• One controlled study found that exercise order didn't make a big difference to long-term strength, muscle, or endurance gains in moderately active men.
  (source: https://pmc.ncbi.nlm.nih.gov/articles/PMC7224562/)
• Combining cardio and weights in the same workout is usually fine for the average person—though explosive strength can take more of a hit.
  (source: https://theconversation.com/training-cardio-and-weights-during-the-same-workout-probably-wont-hurt-your-gains-heres-why-187290, https://pmc.ncbi.nlm.nih.gov/articles/PMC7224562/)
• The type of cardio matters: Running causes more interference than cycling, likely because running puts more stress and impact on your legs.
  (source: https://theconversation.com/training-cardio-and-weights-during-the-same-workout-probably-wont-hurt-your-gains-heres-why-187290, https://body-data.jp/en/studies/concurrent-training-interference-meta)

How Order Affects Performance and Recovery

Acute performance:

• Hard cardio before heavy lifting can lower your lifting performance right away—fewer reps, slower bar speed—because you're pre-tired and low on stored energy (glycogen).
  (source: https://pmc.ncbi.nlm.nih.gov/articles/PMC11688070/, https://www.intutraining.com/the-interference-effect-what-is-it-and-do-i-need-to-worry/, https://www.forgebiology.com/2025/10/11/should-you-do-cardio-before-or-after-lifting-evidence-based-guide/)

Endurance outcomes:

• Good news for runners: your cardio gains (like VO₂max) are usually preserved even when you also lift weights.
  (source: https://blog.gymstreak.com/how-to-minimize-cardio-and-strength-training-interference/, https://www.barbellmedicine.com/blog/concurrent-training-and-the-interference-effect/)

Muscle recovery and hypertrophy:

• Studies show smaller muscle growth results when cardio and strength happen on the same day compared to separate days.
• Giving 3 to 24 hours between the two types of training helps recovery and results more than just tweaking the order.
  (source: https://pmc.ncbi.nlm.nih.gov/articles/PMC11688070/, https://www.thewholehealthpractice.com/post/concurrent-training-for-strength-and-cardio-how-to-avoid-the-interference-effect, https://www.fitnesssimplified.org/training/the-interference-effect-fact-or-fiction)