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Comment s'asseoir dans la bonne direction, selon des entraîneurs personnels!
"learn How to Do Sit ups the Right Way, According to Personal Trainers!
How to Make Sit-Ups More Effective.
The sit-up test is one of the standard tests used to assess abdominal, core and hip flexor strength and endurance during military (Army, Navy, Air Force), law enforcement (police and firefighter), and other common physical fitness tests.
These tips will help you learn how to do more sit-ups, increase your abdominal and core strength and endurance, and pass your next fitness test."