An effective exercise for the oblique muscle. It helps to prepare for elevated leg raising.
Stand between the parallel bars, so that your forearms are placed on the pads.
Cross your legs or just bring them together and lift them up.
As you exhale, lift the legs bent at the knees until they get parallel to the floor. Lift them up to the right, then bring them down. Breathe in and lift the legs to the left.
Pause for 2-3 seconds at the each top position and, as you inhale, slowly return to the starting position.
Don't swing your body and don't jerk up your legs.
Side turns are forbidden for people with lower back problems.