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BEST SIT UP VARIATIONS AND ABS WORKOUTS

The sit-up (or curl-up) is an abdominal endurance training exercise commonly performed to strengthen and tone the abdominal muscles. It is similar to a crunch (crunches target the rectus abdominus and also work the external and internal obliques), but sit-ups have a fuller range of motion and condition additional muscles. It begins with lying with … More BEST SIT UP VARIATIONS AND ABS WORKOUTS