Move Targets: Obliques and Abdominals
Keep it together. Sit on the floor with your knees bent, feet on the floor and legs glued together. You'll clasp your hands together, too with arms extended out to one side to start.
Lean back. The purpose of the Russian twist is to completely engage the transverse abs, which are also known as the "six-pack" muscles. Depending on core strength, you could lean a few inches or nearly a foot before you feel abs entirely brace. Find your sweet spot.
Side to side. Move the arms up and over the top of the knees like a rainbow arch, dropping them down to the opposite side. This is when your obliques, the muscles on the sides that shape your waist, really get to work. You should keep your gaze straight ahead and slightly up, but if you're dealing with neck issues, you can turn your head with your twists.
Balance is key. As you're twisting, keep your sit bones or hips pressed into the ground with equal pressure.
Modification: If you're experiencing back pain or problems, you can try placing a squishy ball or pillow behind you. Make your range of motion smaller by not dropping your hands completely down to the other side.
>> Work it more: Advanced Russian Twist