Travis Kelce and Jason Kelce are shaking up the cereal aisle, but they can’t shake their hilarious brotherly antics!

The NFL pros collaborated with General Mills to create their new Kelce Mix Cereal, and PEOPLE has an exclusive behind-the-scenes look at the pair on set of the campaign shoot.

In the clip, Travis, 34, is wearing a T-shirt that says, “Cereal Training Camp.” With a cereal bowl in one hand and a spoon in the other, the Kansas City Chiefs player coos, “I got the Honey Nut Cheerios choo choo train!”

The camera follows Travis as he moves the spoonful of milk and cereal directly into the mouth of Jason, who is in a surprising position. The Philadelphia Eagles alum, 36, is caught halfway through a supersized Cheerio ready to go head first down a slide. Despite his pose, the father of three happily accepts the cereal while the Honey Nut Cheerios mascot watches on.

The video is just a snippet of the General Mills’ Cereal Training Camp series, which will show the brothers competing in cereal-inspired challenges like a “Cinnadust sprayer and the Lucky Charms Marshmallow Mission,” according to a statement from General Mills. Videos of their breakfast-focused competitions will be released on social channels soon but a date has not been specified.

Each box of Kelce Mix Cereal combines their three favorite cereals: Cinnamon Toast Crunch, Lucky Charms and Reese’s Puffs. (They first revealed their go-tos in an episode of New Heights with Jason and Travis Kelce.) The cereal mixture comes in a special box with a big photo of the brothers hugging and a bowl of the jumbled cereal.

According to the brand, the limited-time smorgasbord box will be sold at grocery stores nationwide beginning in September.

Also beginning in September, cereal purists who like to keep their bowls to one type will have four limited-edition Kelces’ Pick boxes to choose from.

Boxes of Cinnamon Toast Crunch, Lucky Charms, Reese’s Puffs and Honey Nut Cheerios will have specific packaging to show the brothers’ stamp of approval. The front of each box will have a banner that reads, “Kelces’ Pick” and a photo of Jason and Travis. The back of each cereal box will feature a special game, like a Cheerios-filled maze with caricatures of the brothers.