Frankie Muniz has revealed the brutal schedule he had to keep in order to continue racing in NASCAR while filming the Malcolm in the Middle reboot.

The 40-year-old kept up his full-time NASCAR Truck Series commitments throughout last year's filming process, a six-week process Muniz described as 'exhausting' to Entertainment Weekly.

The show's creator Linwood Boomer revealed in the feature that Muniz's schedule ended up the toughest to work around, even more so than Breaking Bad star Bryan Cranston.

The constant nature of Muniz's NASCAR commitments proved the issue – needing to be at a racetrack early pretty much every Friday, and racing through until late in the night.

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Muniz thankful to producers for working around NASCAR schedule

With filming taking place in Vancouver, Canada, the travel schedule for Muniz ended up gruelling – telling the magazine: "I would film Sunday through Wednesday, fly Thursday, race Friday, and fly back Saturday.

"It was exhausting, but I also know how cool it is to have the opportunity to get to do this again, so I wasn't going to complain at all. I am so thankful to everybody on the production for working around my NASCAR schedule."

Ultimately, it wasn't his titular role in Malcolm in the Middle that ended up putting a true dent in Muniz's rookie Truck season, but something significantly more mundane.

He suffered an enforced six week absence from the sport last year after a distal radius fracture...sustained from falling off a ladder at home while trying to change the batteries in his Ring doorbell. Just goes to show – you can spend your life around Hollywood and motor racing, but it's never all glamour.

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