Crunch con mancuerna
Core · Dumbbell
How to do it
On your back with knees bent and a dumbbell held against your chest with both hands. Curl the spine bringing your sternum towards your pelvis, squeeze for a second at the top and lower over two seconds without collapsing. To make it harder without more weight, extend your arms with the dumbbell overhead: moving the load away from the axis lengthens the lever. You feel the upper abs. It is the simplest way to PROGRESS on abs without machines: a plain crunch runs out of road after a few months.
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