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. Unsurprisingly, his workouts are similarly demanding. Latest Videos From You may like “I like to keep things simple,” he tells Fit&Well, describing a typical 600-rep core finisher he swears by to underpin his feats of strength and endurance. “Anyone can do this at the end of a session, once or twice a week,” he insists. And, in fairness, he’s right. The routine predominantly requires just your bodyweight, with the option to add a dumbbell to make it harder—in case 600 reps feels like child’s play. But if you’re a complete beginner, or under particular time constraints, a safer way to approach this routine would be to cut it down to a more manageable size. Start your week with achievable workout ideas, health tips and wellbeing advice in your inbox. How to do …