The Floor Seated Shoulder Press will work your upper body, primarily working on shoulder strength. Maintaining your position will also work into your core (obliques and anterior core) and hip flexors. Your hip and shoulder mobility will also be challenged. By working both arms at the same time, this exercise can also help to correct and reduce muscle imbalances, reducing your risk of injury.
Sit on the floor with your legs apart so that they make a 45 degree angle between them. Using a Dumbbell or Kettlebell, bring the weights to your shoulders. Press the weights into the air, achieving straight arms at the top of the movement. Your two arms should be parallel at the top of the movement, either side of your ears. It is important not to let your body lean forwards or backwards, which will force you to engage your core and hip flexors.
You should use a slightly lighter weight than you would for other shoulder press variations due to the difficulty of this movement.