Skip to Content

Tired After Leg Day? (This Could Be Why!)

I may receive a commission for purchases made through product links on this page, but I always stand by my opinions and endorsements!

Ever wondered why you feel so tired on leg day?

Don’t panic, we’ve got you covered.

In this article, we cover the reasons why you feel tired on leg day as well as some tips, tricks and hacks to help reduce tiredness.


Lets get going!

Here’s why leg day makes you feel tired:

Leg day makes you feel tired as you lose a lot of sweat. This can make you dehydrated and low on electrolytes; both of which contribute to fatigue. Also, many people eat more food on leg day which can cause blood sugar fluctuations. This also leads to tiredness.

Reasons Why Leg Day Makes You Feel Tired

You Take Pre Workout On Leg Day

Thanks to its ability to improve focus, energy and fat loss, many people take pre workout on leg day.

Now one of the main ingredients of pre workout is caffeine, and some pre workouts contain a whopping 400mg of caffeine per serving!

(This is the equivalent to 4 cups of coffee’s worth of caffeine.)

But caffeine is a double-edged sword.

While it helps you feel energized in the short term, once it’s worn off, it can leave you feeling like a zombie.

And so, if you take pre workout on leg day to give you that burst of energy, don’t be surprised if you feel drained afterwards.

(Related Reading: This Is Why Pre Workout Makes You Feel Tired!)

You Eat A Lot Of Carbs On Leg Day

A lot of people consume a large amount of carbs on leg day, and for good reason too.

Carbs are your muscles’ preferred source of energy.

When you eat carbs, your blood sugar levels spike up as the carbs are broken down into sugar.

But since high blood sugar levels are toxic, your body releases insulin which instructs your cells to take in the sugar.

This sudden spike and drop in blood sugar can result in an energy crash which can leave you feeling tired.

(Related Reading: Should You Eat More On Leg Day?)

You Burn A Lot Of Energy On Leg Day

There’s no doubt that leg day is the hardest workout there is.

One of the reasons if that your legs are the largest muscle group, and so they require the most energy to exercise.

This can leave you in a calorie deficit, which will help you lose weight, but also leaves you feeling low on energy.

(Related Reading: Does Leg Day Burn The Most Calories?)

You Sweat A Lot On Leg Day

As we’ve just covered, training your legs requires a ton of energy/calories.

Now when your body burns calories, heat is generated in the process.

But the body can only survive within a very small temperature frame.

So in order to cool you down, you end up sweating buckets on leg day.

Unfortunately, this can leave you feeling tired for 2 reasons.

First, if you’re not replacing the water lost in sweat, you could end up dehydrated, which causes tiredness.

And second, if you’re not replacing the minerals lost in sweat, you could end up with a mineral imbalance, which also causes tiredness.

How To Stop Feeling Tired On Leg Day

Avoid Taking Pre Workout On Leg Day

If you do supplement with pre workout on leg day, then it may be the reason why you’re feeling tired.

So the obvious remedy is to just stop taking pre workout.

That said, there are some caffeine-free pre workouts on the market which are less likely to make you feel tired.

The one I love the most is Genius Pre Workout Powder.

It’s a caffeine-free pre workout that includes an adaptogen called Rhodiola Rosea. This helps you feel alert and focused without the nasty caffeine crash.

Check price and read more reviews of Genius Pre Workout Powder on Amazon.

Save Your Carbs For The Evening

If you’re one to stuff your face with syrup and pancakes before training legs, then that may explain why you’re low on energy on leg day.

Instead, you should eat the bulk of your carbs at night as this well help you relax before going to sleep.

This will help you feel revitalized and fresh the next day after a good night’s sleep.

Drink More Water Around Your Leg Workout

Replacing the water lost in sweat is crucial if you don’t want to feel fatigued.

But rather than drinking 5 litres of water while you’re training legs, it’s best to drink a consistent amount over the course of the day.

Otherwise, if you binge it all while training, you could end up being sick!.

Take Himalayan Pink Salt

Replenishing minerals lost through sweating is also key if you want to avoid tiredness.

You can do this through various means, including taking electrolyte supplements, or even adding a dash of Himalayan pink salt to your meals.

(I prefer the second option, as it tastes delicious and offers plenty of other health benefits too.)


Whether it’s from taking pre workout, eating carbs before training, sweating a ton, or using up loads of energy, leg day can make you feel tired for various reasons.

Some folks reading this article will be pre workout users and others will have a carb-heavy meal for breakfast.

So the best thing to do is to figure out why you feel tired on leg day and then do something to alleviate it.

Well, that’s it for today’s article folks.

Thanks for sticking with me to the end, I do appreciate your time.

And I hope I’ve answered all your questions, but if not, then do drop them in the comments below.

See you in the next one.


You might also find these articles interesting…