You can get free double protein at Chipotle on Jan. 13. Here's how.

Chipotle is just one of many restaurants focusing on protein, and on Jan. 13, they are looking to give you more protein for free.

The restaurant chain is offering an extra scoop of protein – free of charge – to Chipotle Rewards members on "one of the most popular days to work out." According to Chipotle, customers can pair the offer with a bowl, burrito or salad order.

In addition to the "free double protein offer," Chipotle Mexican Grill recently introduced a "High Protein Menu" in late December so customers could get "protein they want in the portions that work for them, whether that is a lighter bite or a more substantial build."

"With clean protein being a pillar of our core menu, our restaurants have long been popular destinations for athletes and gym-goers to refuel," Stephanie Perdue, Vice President of Brand Marketing, said in a statement. "By offering free double protein for Chipotle Rewards members on January 13, we're making it easier to power progress with real food."

Here's what to know about the offer, including how to claim it.

How can I get free double protein at Chipotle?

Chipotle Rewards members who order a bowl, burrito or salad with double protein can use the code "PROTEIN" to get an extra portion of meat, or Sofritas for free. Adobo Chicken, Steak, Braised Beef Barbacoa, Carnitas and Sofritas are all eligible protein options.

According to Chipotle, the offer is only valid for digital orders placed through the Chipotle app, or online at Chipotle.com and Chipotle.ca. The code to unlock the offer can only be used one time per transaction.

The offer can also be paired with a custom entrée with double protein, or for double protein entrées from Chipotle's High Protein Menu.

What does Chipotle's High Protein Menu include?

From a 4-ounce cup of meat to a "High Protein-High Fiber Bowl," Chipotle's High Protein Menu has enough offerings to match pretty much any need or lifestyle:

• Double High Protein Bowl (81 grams of protein): Burrito bowl with double adobo chicken, light white rice, black beans, fajita vegetables, tomato salsa, Monterey Jack cheese and extra romaine lettuce.
• High Protein-High Fiber Bowl (46 grams of protein): Bowl with adobo chicken, light brown rice, black beans, fajita vegetables, roasted chili-corn salsa, tomato salsa and romaine lettuce.
• High Protein-Low Calorie Salad (36 grams of protein): Salad with adobo chicken, supergreens lettuce mix, fajita vegetables, tomato salad and guacamole.
• Double High Protein Burrito (79 grams of protein): Burrito with adobo chicken, tomato salsa, fajita vegetables, Monterey Jack cheese and romaine lettuce.
• High Protein Cup (32 grams of protein): 4-ounce size of adobo chicken or steak.
• Adobo Chicken Taco (15 grams of protein): Soft flour tortilla, adobo chicken, fajita vegetables, tomato salsa, Monterey Jack cheese and romaine lettuce.

Chipotle "superfans" New York Knicks guard Josh Hart, health content creator Samantha Milton and dietician Kylie Sakaida also partnered with the brand to launch three new items, a "high protein" version of their own go-to orders:

• Josh Hart’s High Protein Burrito (95 grams of protein): Burrito with double adobo chicken, white rice, black beans, tomato salsa, roasted chili-corn salsa, sour cream and Monterey Jack cheese.
• Smaller Sam’s High Protein Tacos (40 grams of protein): Three corn tortilla tacos with adobo chicken, light-roasted chili-corn salsa, fajita vegetables, tomatillo-red chili salsa and sour cream.
• Kylie’s High Protein Chicken Bowl (52 grams of protein): Bowl with adobo chicken, half white rice and half brown rice, half black beans and half pinto beans, extra fajita vegetables, tomatillo green-chili salsa, Monterey Jack cheese and romaine lettuce.

Contributing: Greta Cross, USA TODAY