{"version":"1.0","type":"link","title":"Sit-up - Newikis","description":"The sit-up is an abdominal endurance training exercise to strengthen, tighten and tone the abdominal muscles. It is similar to the curl-up (that targets the rectus abdominis and also works the external and internal obliques), but sit-ups have a fuller range of motion and condition additional…","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400,"thumbnail_url":"https://thumb.wikimedia.org/wikipedia/commons/thumb/9/97/Abdominal_Exercise_Training.jpg/1280px-Abdominal_Exercise_Training.jpg","thumbnail_width":1280,"thumbnail_height":853}