Here's where you can get a free root beer float on Tuesday, August 6

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At least four restaurant chains will offer root beer floats on Tuesday, Aug. 6, as part of a National Root Beer Float Day promotion.

A root beer float is a drink consisting of vanilla ice cream in a glass or mug of root beer, a non-alcoholic soda.

Read on to find out how to make your own frozen treat.

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At A&W, one person will have to earn their float, the company said in an Aug. 1 statement.

But that won’t be the case. Also hard.

A&W's ad for its root beer floats says "Brain freeze is just weakness leaving your body"

A&W is one of several chains offering free root beer floats on August 6 for National Root Beer Float Day. (A&W / Fox News)

“On National Root Beer Float Day, August 6, simply show off your ‘Float Flex’ — that is, flaunt your new physique with your best muscle-flexing pose — at any participating A&W restaurant in the U.S. between 2 p.m. and 8 p.m. local time,” the company said in the release.

A&W has branches in 36 states.

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Customers who choose to participate in a “Float Flex” will receive a free small root beer float, A&W said.

No purchase is necessary for the free drink, they said, but suggested customers donate to the nonprofit Disabled American Veterans, which A&W partnered with during National Root Beer Float Day.

Customers wanting a free root beer soda will have to show their “Float Flex” at A&W restaurants, the company said. (A&W)

The “Float Flex” promotion was inspired by the weight of the root beer soda served at A&W, the company said.

“The iconic A&W Root Beer Float is, without a doubt, one of the heaviest beverages in the quick-service restaurant industry,” Liz Bazner, A&W’s vice president of marketing and innovation, said in the Aug. 1 release.

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Bazner continued, “It’s so heavy that we were worried we were missing out on an entire untapped market of people who just can’t handle its sheer size. This National Root Beer Float Day, we wanted to get everyone pumped and ready to enjoy their free float.”

National Root Beer Float Day is held annually on August 6. (iStock / iStock)

Sister restaurant chains Wienerschnitzel, Hamburger Stand and Tastee-Freez will also be offering free root beer floats with any purchase on Tuesday.

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Coupons for free drinks are available on the chains’ websites.

Wienerschnitzel has locations in 11 states, as well as a “Wiener Wagon” food truck in Southern California. Its locations serve Tastee-Freez ice cream, the chain’s website says.

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Hamburger Stand is located in Arizona, California, Colorado and Wyoming.