Kori Sampson swears by a 600-rep abs finisher to strengthen his core—here’s how to tailor it to your ability

Man doing sit-up exercise outside on a patio with cliffs and the sea behind him.

Model, endurance athlete and iFIT trainer Kori Sampson doesn’t do things by halves.

In 2025, he ran the width of Britain—a formidable 755km including 8,185m of elevation—then followed it up by conquering the inaugural Trainer Games to be crowned iFIT's next star trainer.