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According to Prevention Magazine, it's best not limit core strength exercises first thing in the morning.
That's because during the night, your disks fill with fluid, making your spine tight and stiff in the early morning hours and increasing your risk for injury. If you must do a core strength workout in the morning, do a longer warm-up - about 15 minutes - to allow some of that fluid to disperse.
Otherwise, do yourself a favor and exercise your core later in the day when your back is loosened up.