Running twice a day — often referred to by runners as "doubles" or "double runs" — is a training strategy long used by elite marathoners to build mileage and speed up recovery time. However, dedicated amateur runners can also use this technique to take their endurance to the next level. Here is our expert guide on how double runs work, who should try them, how to structure your training week, and how to avoid overtraining.
The Golden Rule: Doubles should supplement your training volume, not replace your continuous long runs. Quality rest, adequate fuelling, and gradual progression are essential to making two-a-day sessions work for your body.
What is a Double Run?
A double run involves splitting your daily training into two distinct sessions — typically one in the morning and another in the late afternoon or evening. Instead of running ten miles in a single continuous session, a runner might complete seven miles in the morning followed by three easy miles in the evening.
While elite athletes rely on doubles to log over 80 miles per week, everyday runners often use them to safely increase volume or fit training around a busy work schedule.
Should You Run Twice a Day?
While doubling up offers clear performance perks, it is not suitable for every runner.
Who Can Benefit from Double Runs?
- High-Mileage Runners: Athletes already running 45 to 50 miles per week who want to increase volume without making single runs excessively long.
- Marathon & Ultra-Trainees: Runners building physical and mental resilience to perform effectively on pre-fatigued legs.
- Runners with Busy Schedules: Busy professionals who find it easier to fit two 30-minute runs into their day rather than one continuous 60-minute session.
Who Should Avoid Double Runs?
- Beginners: If you are building your baseline endurance or running less than four days a week, stick to single sessions.
- Runners Returning from Injury: Doubling increases stress on joints, tendons, and muscles, raising injury risks if your body is not fully recovered.
Benefits & Drawbacks of Running Doubles
While doubling up offers clear performance perks, it is not suitable for every runner.
Advantages of Double Runs
Running in a partially glycogen-depleted state teaches your body to burn fat more efficiently for fuel.
A short, gentle evening run boosts blood flow to active muscles, helping flush out metabolic waste.
Adding a light 20-minute shakeout run once a week easily adds extra volume to your weekly total.
Considerations & Drawbacks
Splitting sessions requires extra discipline with sleep, nutrition, and recovery.
Two runs mean double the time spent warming up, showering, changing, and prepping kit.
Skipping rest days in favour of doubles can quickly lead to chronic fatigue if unmanaged.
How Do You Structure Double Run Days?
Structuring your double days correctly ensures you gain aerobic benefits without burning out.
Allow your body adequate time to rest and refuel between workouts. A morning session at 7:00 AM followed by an evening run at 5:00 PM gives your muscles time to replenish glycogen stores.
Never attempt two intense workouts in a single day. Pair a morning interval session or tempo run with a very light, easy-paced evening run. Keep the second session at a strictly conversational pace.
Never replace your weekly continuous long run with two shorter runs. Long, uninterrupted efforts are essential for developing tissue durability, mental stamina, and cardiac capacity for race day.
Even when splitting sessions, do not increase your overall weekly mileage by more than 10% per week. Gradual progression gives your connective tissues time to adapt to the extra impact.
Expert Tip: Adding extra mileage increases repetitive impact on your feet and joints. Visit your local Runners Need store for a personalised Gait Analysis. Our experts use video technology to evaluate your stride and fit you with supportive trainers tailored to your running style.
How Do You Fuel for Running Twice a Day?
Running twice in 24 hours places high demands on your energy stores and hydration levels:
- Prioritise Post-Run Carbohydrates: Consume a mixture of carbohydrates and protein within 30 minutes of finishing your first run to replenish glycogen before session two.
- Hydrate Continuously: Sip water and electrolytes throughout the day rather than chugging fluids right before your second run.
- Focus on Recovery Gear: Utilise foam rollers, massage guns, or compression wear between sessions to soothe tight calves and hamstrings.
Get Race Day Ready
Running twice a day is an effective tool for high-mileage runners looking to boost volume, enhance recovery, and adapt to fatigue. However, beginners and injury-prone runners should prioritise building a strong base through consistent single runs first. Always listen to your body, fuel thoroughly between sessions, and protect your continuous weekly long run.
Ready to support your higher-mileage training? Explore our range of cushioned running shoes, technical running clothing, and recovery gear at Runners Need today.
FAQs
Yes, for experienced runners with a strong base, double runs are safe if you listen to your body, fuel properly, and avoid overtraining.
Running twice a day increases your calorie burn and can support weight loss, but you must balance training with adequate nutrition to avoid fatigue or illness.
Increasing your weekly mileage and training frequency can improve your aerobic capacity, endurance, and running economy, which can translate to faster times.
It depends on your goals. For building endurance, single long runs are essential. For boosting weekly volume or recovery, doubles can be effective.
Eat a balanced meal or snack after your first run, stay hydrated, and consider a light snack before your second run to ensure adequate energy.
It’s best for beginners to focus on building a consistent routine with single runs before attempting doubles.
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