Running After Leg Day: Beast Your Legs For Powerful Gains

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Some of us love it, some of us hate it, but one thing is certain when it comes to leg day: it’s nearly guaranteed to be a killer workout that taxes your legs until they almost feel jelly-like, spent from your hard efforts.

Leg day probably can’t be considered “fun” per se, but squats, deadlifts, lunges, and other strength training exercises for your legs are an important component of most well-rounded fitness programs.

But how does leg day fit into your overall workout routine? Should you go running after leg day? Can you boost your leg gains by running after lifting weights? Furthermore can running after leg day improve your recovery?

In this guide, we will look at running after leg day and how a hard leg workout affects running to help you decide if you should run before or after lifting weights.

In this guide, we will cover: 

  • What Is Leg Day?
  • Why Is Leg Day Hard?
  • Should You Go Running After Leg Day
  • The Potential Benefits of Running After Leg Day
  • The Drawbacks of Running After Leg Day
  • Should I Run Before Or After A Workout?

Let’s get started!

A person doing a lunge in a gym.

What Is Leg Day?

What exactly do we mean by “leg day”? If you’re relatively new to working out, it may be helpful to have a quick overview of common weightlifting workouts. 

Generally speaking, there are two primary approaches to programming strength training workout routines: total-body workouts or body splits.

As the name describes, total-body workouts are routines that include exercises that in sum, use all the major muscles of the body, giving you a full-body workout. 

In other words, if you are doing a total body workout, there will be exercises that target your arms, others that will work your chest or back, exercises that strengthen your abs and core, and, of course, exercises that primarily target your legs. 

It’s also common to have several full-body exercises, such as burpees, or compound movements that involve several major muscle groups. For example, a total-body workout might include exercises like a reverse lunge with an overhead press or a side lunge with a bicep curl.

A person doing a leg press exercise.

In most cases, if you are following a total-body workout routine, you will perform 2-3 of these full-body workouts per week.

Body part splits or split workout routines focus on one or two particular body areas per workout. Typically, the body is partitioned into arms and chest in one workout, back and core in another, and then legs, though there’s plenty of variability, particularly within the pairing and splitting of arms, core, chest, and back.

If you are following a split workout routine, all or nearly all of the exercises for any given day are focused on the particular body area.

For example, on arm day, you wouldn’t have squats or lunges, unless potentially paired with an upper-body exercise. Similarly, on legs day, you won’t find pull-ups or push-ups on the lineup.

Getting back to the question at hand, leg day refers to the leg-centric workout in a body part splits workout routine. Leg day often includes exercises such as heavy squats, lunges, deadlifts, step-ups, box jumps, bridges, and other lower-body plyometrics and strengthening exercises.

A person doing a single-leg bridge on the beach.

Why Is Leg Day Hard?

Leg day earns it’s reputation as being a particularly hard workout because the leg workouts use the largest muscle groups in your body, such as your glutes, quads, and hamstrings.

As such, you end up working more of your total muscle mass, which not only leads to a greater percentage of your body feeling sore the next day, but also is just more exhausting in its own right.

The more muscle mass you recruit for an exercise, the more metabolically demanding and fatiguing it can be, especially when you are lifting with the goal of increasing power or muscle size.

For this reason, leg day burns though all or nearly all of your glycogen stores, which can leave your body in a depleted state after the workout.

Finally, the effects of leg day are usually more noticeable because you use your legs for just about everything—from standing and getting around to running, climbing stairs, and getting out of a car. It’s somewhat easier to avoid feeling the residual soreness from an arm-focused workout, because you can more easily go about your day minimizing the use of your arms.

A person doing a lunge with dumbbells.

Should You Go Running After Leg Day?

Much in the same way that the delayed-onset muscle soreness (DOMS) after leg day can affect your comfort level (versus soreness) as you go about your normal everyday activities the next day or two, a leg workout can have a more significant impact on any subsequent exercise.

In other words, since most types of exercise use your legs to some degree, whatever type of workout you do after leg day will almost invariably be started with extremely tired legs.

While an activity like swimming or cycling will still recruit your leg muscles, the low impact can be gentler on fatigued legs.

In contrast, running almost doubles down on the work you did in the gym, adding further demands to you’re already tired glutes, quads, hamstrings, and calves, which is essentially why many people wonder whether they should go running after leg day.

Moreover, from an energy standpoint, running right after a hard leg workout means you’re starting your run from a glycogen-depleted state. Glycogen, which is the body’s storage form of carbohydrates, is the body’s preferred fuel source for both a weightlifting workout and running. 

Although it’s possible to use this to your advantage, it can make running after a strength training workout a lot more challenging, as it forces your body to burn fat for fuel rather than carbohydrates.

Ultimately, whether you should go running after leg day is mostly dependent on your fitness goals and overall fitness routine. 

A person doing a leg extension.

The Potential Benefits of Running After Leg Day

There are potential benefits of running after leg day, and depending on your fitness goals and priorities, these training perks may make this a good way for you to structure your routine. 

#1: Running After Leg Day Can Help You Get Better At Burning Fat

As mentioned, running after a workout can train your body to get better at oxidizing fat for energy at higher intensities. In general, fat and carbohydrates provide the majority of energy when you exercise, with protein contributing up to 10-15% on average, depending on your diet, nutritional status, and exercise intensity and duration.

At lower intensities of exercise, such as efforts in zone 1 and zone 2, the muscles primarily rely on stored fat as the substrate to produce ATP, the energy molecule used by the body to work. 

As the intensity of physical activity increases, the ratio of the reliance on fat versus carbohydrates shifts, and we start burning far more carbohydrates (glycogen) to fuel the muscles, which is why leg day burns though your glycogen stores and running tends to deplete glycogen as well (unless you’re running very easily).

A person doing a squat.

This isn’t necessarily problematic, but certain athletes wish to train their body to be better at oxidizing fat at higher workloads because we have limited glycogen stores relative to fat stores. 

The muscles and liver can together store enough glycogen for roughly two hours of intense exercise, after which we will have to rely nearly entirely on fat and protein to fuel the body. 

Since producing energy by burning fat and muscle is a slower and less efficient process, your ability to exercise intensely can quickly drop off once your glycogen stores are depleted.

If you’ve ever run a marathon or have heard of the infamous “bonking” marathoners often experience in the final miles of the race, you’re seeing a practical example of glycogen depletion.

Running after leg day can potentially help your muscles become more metabolically flexible, so that they can burn fat more efficiently and spare glycogen for higher intensities later on in a workout. 

In other words, running after a leg workout can be potentially beneficial for a marathoner, triathlete, or other endurance athlete who wants to condition their body to burn energy more efficiently and stably over the duration of a long event.

Two people doing squats.

#2: Running After Leg Day May Increase Weight Loss

Weight loss is essentially a matter of burning more calories than you consume, so if you stack your workouts and go running after working out, you can increase your caloric expenditure.

As mentioned, you’ll also burn a higher percentage of calories from stored body fat compared to running before your workout or in the fed state, so some fitness professionals argue that running after leg day may enhance fat loss.

#3: Running After Leg Day May Speed Recovery

There is evidence to suggest that active recovery can reduce the intensity of DOMS and enhance recovery. Light or easy running can increase circulation to tired leg muscles, bringing healing nutrients and oxygen and flushing out metabolic byproducts that can cause soreness.

Two people running after leg day.

Drawbacks of Running After Lifting Weights

Let’s examine the potential downsides of running after a hard leg workout: 

#1: Running After Leg Day Can Increase The Risk of Injury

Any time you do a hard workout, your muscle fibers need time to heal. Microtears occur in the fibers, and it’s only through the recovery process that these fibers build back stronger. 

Recovery from leg day can take 24-48 hours or more, and adding the additional stress and strain of running can overtax already-damaged and depleted muscle fibers.

Moreover, after a hard leg workout, many people have shaky legs, poor coordination, and compromised strength. Running on weak, trembling, or awkward legs can increase your risk of tripping or using a compromised stride, which can also be recipes for injuries.

#2: Running After Leg Day Can Inhibit Your Gains

If you’re looking to build muscle mass (hypertrophy), running after leg day is probably not the best idea. Gaining muscle mass takes a significant surplus of energy (calories), and running after your workout can put you into a negative energy balance, and inhibit the potential gains from the hard workout you just did.

People doing box jumps in a gym.

Should I Run Before Or After a Workout?

Whether you prefer to do total-body workouts, or body splits, leg exercises can definitely impact your run, if you’re trying to lace up and go running right after your workout.

In general, most people find the best way to structure their workout routine is to do whatever form of exercise they prioritize first. In other words, if you’re a competitive runner and your run is your focus, go running before you lift weights. 

If you’re trying to build muscle as your primary goal and just using running as a way to improve your overall fitness, go running after your workout so that your body is firing on all cylinders and strong for your lift.

If you are looking to start up a runner-specific strength training workout, take a look at our weight lifting guides!

A gym.
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Amber Sayer is a Fitness, Nutrition, and Wellness Writer and Editor, as well as a UESCA-certified running, endurance nutrition, and triathlon coach. She holds two Masters Degrees—one in Exercise Science and one in Prosthetics and Orthotics. As a Certified Personal Trainer and running coach for 12 years, Amber enjoys staying active and helping others do so as well. In her free time, she likes running, cycling, cooking, and tackling any type of puzzle.

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