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MediumAbout 4 minOn your own
A dead bug holding a weight straight up over the chest, which makes the trunk work harder.
Video: Muscle & Strength
Also: With a medicine ball
Lie on your back, hips and knees bent at 90 degrees, holding a kettlebell straight above your chest with both hands.
You need: A kettlebell or dumbbell
A lighter weight.
A heavier weight, or lower the leg closer to the floor.