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Research has shown that both sit-ups and crunches are mediocre strength-building exercises and have injured many people. [3] In a crunch, unlike a sit-up, the lower back stays on the floor. This is said to eliminate any involvement by the hip flexors, and make the crunch an effective isolation exercise for the abdominals. [5]
After further research and testing involving over 600 volunteers, he produced a program with ten basic exercises (XBX) for women that required twelve minutes to complete. [7] The programs proved popular with civilians. A U.S. edition was published in 1962 under the title Royal Canadian Air Force Exercise Plans For Physical Fitness. [8]
Abdominal exercises are a type of strength exercise that affect the abdominal muscles (colloquially known as the stomach muscles or "abs"). Human abdominal consist of four muscles which are the rectus abdomens, internal oblique, external oblique, and transversus abdominis. [ 1 ]
Jane Fonda's Workout, also known as Workout Starring Jane Fonda, is a 1982 exercise video by actress Jane Fonda, based on an exercise routine developed by Leni Cazden and refined by Cazden and Fonda at Workout, their exercise studio in Beverly Hills.
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