Ever finish up a run in the summer and notice you’re drenched in sweat? Or maybe you’ve got dried salt all over your face? Summer is prime time for hot weather workouts which means more sweating and electrolytes lost. Sodium is the electrolyte lost in the greatest quantities in sweat, while potassium is lost in smaller but still meaningful amounts.
While this is a normal part of long runs, you may want to pay attention to rehydrating and replenishing electrolytes after your run to account for some of these sweat losses. And one of my favorite ways to do this is with some salted watermelon!
Recently, I took my sweat tracker for a spin to see exactly how much fluid and electrolytes I was losing during a summer workout. Spoiler: it was more than I thought! Let’s take a peek at what I found and how watermelon helps me bounce back faster.
Real-Time Sweat Data
Sweat patches or reusable trackers can estimate fluid and electrolyte losses during a workout. There are a variety of options on the market; all can be finicky sometimes, but they give you a good estimate if you use them a few times and look at the averages.
Here’s an example of my data from an easy-paced 30-minute outdoor run on an 88-degree day.
As a dietitian, I’m generally far more concerned about fluid and electrolyte losses after long runs, not necessarily after these shorter workouts. (Right now I’m pregnant, so I’m only focused on shorter runs.) But I still wanted to show you an example of this helpful data! You can see that even in just 30 minutes, it was estimated that I lost 13.5 ounces of fluid, 409 mg sodium, and 53 mg of potassium.
Recovering Post-Run with Watermelon
There are lots of ways to rehydrate and replenish electrolyte losses after a workout. You might use a sports drink, electrolyte tabs, or food and drinks from the grocery store. Keep in mind that on long runs, you’ll also typically be consuming electrolytes during the run – not just afterwards.
Here’s why I personally think salted watermelon is a powerhouse post-workout choice:
- Watermelon is 92% water! Since your fluid intake can come from a combination of drinks and foods, this makes it a great way to add hydration alongside any beverages. You can eat watermelon as-is, or you can juice it in a blender if you want to drink it instead.
- You lose both sodium and potassium in sweat. Two cups of watermelon provide 310 milligrams of potassium, and ⅛ teaspoon of salt sprinkled on top provides 300 milligrams of sodium. (If you want to spice things up, you could do Tajín instead of salt; a ¼ teaspoon serving of this chili lime seasoning has 190 milligrams of sodium).
- Watermelon has 21 grams of carbohydrates, which helps replenish some of the energy used by your muscles during a workout (especially if it was an intense workout).
- In addition to the hydration benefits, you also get some other helpful nutrients. A serving of watermelon provides 25% of your daily Vitamin C needs, important for a healthy immune system. It also contains L-citrulline (286-1266 mg per 2-cup serving), an amino acid that may support healthy blood flow and exercise recovery, though more research is needed to confirm this.
- And of course, as a bonus, it’s incredibly refreshing and tasty!! (As evidenced by my bliss-induced face below, haha).
Easy Watermelon Hydration Options
Here are several options you can choose for your post-workout watermelon refresher. Keep in mind the exact amount of fluids and electrolytes that you should consume will depend on the length of your run and your personal recovery needs. These are just meant to be generalized examples, not necessarily your full post-run meal or full hydration strategy.
- Simply Salted Snack: 2 cups watermelon + ⅛ teaspoon of salt
- Watermelon Slushie: Blend 2 cups frozen watermelon cubes + juice of ½ lime + ⅛ teaspoon of salt + ¼ cup cold water
- Watermelon Sports Drink: Blend 2 cups fresh watermelon + ½ cup water + juice of ½ lime + ⅛ teaspoon of salt + ½ tbsp honey (optional)
- Salted Watermelon Cucumber Agua Fresca: Blend 2 cups fresh watermelon + ½ cup peeled sliced cucumber + juice of ½ lime + ½ cup cold water + ⅛ teaspoon of salt; pour over ice
- Watermelon Mango Smoothie (for when you need to replenish carbs & protein along with the electrolytes and hydration): Blend 1 cup fresh watermelon + 1 cup frozen mango + ¼ cup tart cherry juice + ½ cup plain Greek yogurt + ½ scoop protein powder + 1 tbsp honey
The Bottom Line
Replenishing fluid and electrolyte losses after a run can help you recover from your workout. Watermelon – fresh or juiced! – is a great option for doing so. Adding a little salt can help round out the electrolyte profile. And it’s one of the tastiest ways to get your summer hydration in!
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