The sit-up is a hip-and-waist-flexion exercise that targets your rectus abdominis and synergistically activates several hip and waist muscles.
Sit-Ups Benefits: Exercises, Variations, and More
Cross step sit ups — Level Up Basketball
Assisted Sit-Up - Video Guide
Sit-Ups Benefits: Exercises, Variations, and More
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V-up exercise instructions and video, Weight Training Guide
Plate Situp
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Sit-up technique, setup and execution. Learn how to perform the Sit-up!