No matter which variations you follow, crunches have the advantage over sit-ups of being able to better target abdominal muscles. "Because the movement is smaller, you can control momentum more," ...
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“HIIT training is extremely efficient. Many people don’t have the time for long, drawn-out workouts and HIIT training is ...
Slow things down and get a deep core workout with this variation on the traditional bicycle crunch. It adds resistance for a bigger burn.
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