The L-sit is one of the greatest tests of overall core strength and stability, says Sean Garner, a trainer at Anatomy at 1220 in Miami Beach, Florida.

It's so tough, you probably won't be able to do it on your first try.

To pass the test in less time, Garner recommends working your way up to the L-sit with a series of progressively harder core exercises. Watch the above video to see Garner demonstrate each of them.

All four will get your core firing, Garner promises. Your goal: Work up to a 60-second L-sit with your palms on the floor.

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