In an exclusive clip of tonight’t new episode,Jack Osbourneseeks medical attention for an unusually high heart rate.

A pre-existing condition makes Osbourne’s situation more precarious.

Osbourne was diagnosed with the degenerative disease in 2012.

SPECIAL FORCES: WORLD’S TOUGHEST TEST: Jack Osbourne in the season premiere of SPECIAL FORCES: WORLD’S TOUGHEST TEST airing Monday, Sep. 25 (9:00-10:00 PM ET/PT) on FOX. CR: Pete Dadds/ FOX. ©2023 FOX Media LLC.

Jack Osbourne in ‘Special Forces: World’s Toughest Test’.Pete Dadds/FOX

“Your heart is getting almost twice as fast as what you normally run,” the doctor says.

“I think with your history, you’ve got to take it seriously.”

Special Forces: World’s Toughest Testairs Monday at 9 p.m. ET/PT on Fox.

Watch the exclusive clip from tonight’s new episode above.