Its an isolation exercise, only the hip joint is used.
Sagital
The proper technique for an abdominal crunch is to make sure that you isolate your abdominal area so that you do not use anything else such as your neck muscles, make sure that you only use the desired area which in this case is the abdominal area
There are many magazines that offer information about abdominal crunch exercises. You can even view videos on YouTube and you can buy exercise videos at electronic stores.
There are several abdominal workouts with different names and poses. Some popular exercises are bicycle, captain's chair, ball crunch, and leg crunch.
Breathe at the start, exhale at the Top.
There are a lot of exercises you can perform with an ab roller, all known as "crunches." These include the basic crunch, the oblique crunch, the raised bent knee crunch, the raised straight leg crunch, the bicycle crunch and the scissors crunch. They all work your abdominal and oblique muscles.
There are many exercises for conditioning the abs. Some of these are the basic crunch, the plank, the bicycle, the abdominal hold, the side crunch, and the hundred.
The hamstrings and gluteous maximus are main muscles involved in diving and the pivot joints on your knee are the main joints you use.
Certain abdominal organs are not involved in the digestive process. In fetal pigs, these organs include the liver and the kidneys.
There is not enough information in the question to answer it. Involved where? Please restate the question.
it involved the vertebrae and the ribs
Any exercise that involves the abdominal muscles or abs will be effective with continued use. Some exercises for abdominal muscles are squats, crunches, the side crunch. There are also exercise equipment made specifically for the abs.