Take a V-Sit position, with feet off the ground and upper body raised up. Engage your core. With a dumbbell in both hands, jab forward with the left dumbbell over right knee, then right dumbbell over left knee. Keep going left to right for as long as possible, ideally until failure.
Fit Media is the largest independent fitness channel on YouTube with over 2 million subscribers. We provide expert training tips and workouts from the world's best personal trainers.
The Fit Media Workout App has training plans you can follow and all the tools you need to track your progress in the gym.
Established in 2011, we've been a source of expert workout information for over a decade.