More to explore:
What's a Russian twist?
Gonna have to Google a Russian twist??
A Russian twist is when u sit on the floor, bend your knees, keep your feet on the floor (or hold them off the floor if u want a challenge) and put your arms out in front of u, clasp your hands. Twist to one side until your arms are parallel to the floor, then go back to the middle and twist to the other side. U can hold a water ball, dumbbell or other weight to make it harder.
Why are reverse crunches???