A short core session two to three times a week should be sufficient to make a difference to your core strength. “Core workouts should be a supplement to your training,” says Bines. “Focus on the exercises that get you the most bang for your buck: a squat, a deadlift—you’re still using your core in these exercises too—and then you can add in some core exercises to supplement that.” Think five to 10 minutes at the end of a training session.