Begin sitting with a dumbbell in each hand, held together at your chest with palms facing toward each other. Keep your core tight and pulled in to your spine as you extend and lift your legs, leaning back onto your tailbone while keeping your chest lifted.
Twist slowly to the left, bringing the dumbbells to your left side. Rotate from your ribs and avoid swinging your arms, keeping the dumbbells close to your body.
Rotate back through the center and to the left, twisting your torso and bringing the dumbbells to the left. This completes one rep.
Do as many reps as you can in 45 seconds while maintaining proper form. You can modify the movement by bending your knees or dropping one or both of the weights.
