International Sports Sciences Association. Sit-ups and crunches have been discouraged by educators within the industry for years, but there are no licensing or continuing-education requirements for teaching exercise, and if trainers don’t seek out new information and techniques, it can take a while for good information and new ideas to get through to them. Like many other American industries, the fitness business is consolidating, but it still contains tons of independent instructors and small businesses. If you hadn’t yet noticed crunches disappearing around you-or if you have a trainer who still puts you through your sit-up paces-McCall said he wouldn’t exactly be shocked. Spokespeople for the Army and the Marines confirmed that these decisions in their branches were made in part to avoid the high rates of lower-back injury found among troops training for speed sit-up and crunch tests. military has begun to phase out sit-ups and crunches from their required testing and training regimens, or else they have made them optional, alongside more orthopedically sound maneuvers such as the plank. In the past decade, every branch of the U.S. findings showed that sit-ups and crunches weren’t just mediocre strength-building moves they were actually hurting lots of people.
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