Seated Watermelon Twist
Sit on a mat with your feet and torso lifted from the ground, holding a watermelon with both hands out in front of your abs with your arms slightly bent.
Bring the watermelon to one side almost touching the ground with the watermelon. Keep your legs and torso lifted during the exercise.
Bring the watermelon to the other side touching the ground again, as quickly as possible. Repeat the exercise according to the training plan alternating sides.