Stop it. You're just asking for trouble. Here's why.
STOP doing SIT UPS!
How to Do:SIT-UP TWIST
Static and Dynamic Stretching: Tips for Athletes
Tip: Train Your Glutes for a Bigger Squat
Tip: Never Do Twisting Sit-Ups
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Decline Twisting Sit Up: Easy Way To Challenge And Work Your Obliques
Tip: Train Your Glutes for a Bigger Squat
Sit-Up: Twist - Bent Knee