How to do: Curl Ups

Lie on back, with hands tucked behind lower back and elbows out to the sides, one leg straight, the other bent with knee up and foot resting on floor. 1 rep is: slightly lift elbows, flex core to lift shoulders and head just barely off the floor, keeping spine & neck neutral/straight. Do not curl neck. Hold for a count of 8. Relax. The idea is if the floor behind the head and shoulders were a scale, the flex just barely causes the scale to read zero. Very little actual motion.

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