13. Reverse Fly

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Use a stand-up machine with a waist-high bar.

Keeping your knees straight, bend at the waist, then โ€œflyโ€ back up.

Donโ€™t over-extend, just keep your line straight as you come up.

Repeat for 3 sets of 12.

It doesnโ€™t sound like much, but this is great for your core!