The shoulder press is a classic exercise which is usually performed using dumbbells, but can be done using kettlebells instead. This exercise works your shoulders and will increase your strength in any vertical push exercise. It is a static movement and should be performed slowly and with care.
Start with your elbows out at a right angle and do not drop your elbows below shoulder height. Push the dumbbells up to the ceiling, making sure you do not let them touch at the top as this will mean you lose tension in your shoulders. Slowly lower the dumbbells back down to the starting position, this is one rep. Breathe out as you push up, and breathe in as you lower back down. Really control the movement and you should feel a burn building up in your shoulders.