The side kick is called Yokogeri in Shotokan. Yoko means sideways so it is quite easy to understand why they use this term. In Wado, the same kick has a different name: Sokuto. For completeness you could say Sokutogeri, but this is not common. The name Sokuto comes from the position of the foot, which you can understand from the Kanji.
足刀 = Sokuto
足 = Soku (also pronounced as Ashi) means foot
刀 = To (also pronounced as Katana) means sword or knife
You could conclude that 足刀 refers to the cutting side (edge) of the foot. This is the part of the foot that is called Sokuto.
There are several different kinds of Sokuto, like Fumikomi (stamp), Kekomi (thrust) and Keage (swing upwards). The dynamic of Sokuto Fumikomi and Kekomi is the same, it is a thrusting movement. The different dynamics have been discussed before, so if you have forgotten about it, don't remember it clearly or haven't seen it yet you can read the blog on that subject.
Below you will find this weeks video, photos and text with several exercises that you can use to practice and develop Sokuto.
In this blog I share two trainingmethods, which I cut up in different exercises so that you can develop step by step. The first method is about the position of the foot. I explain and demonstrate these in the video.
To start, focus on controlling the movement of your toes.
Tilt your feet while you position your toes correctly.
Kick with the edge of your foot against the ground (be careful with any hard surface). You will feel instantly whether your foot is in the right position or not.
Twist your body already, so that you do not have to worry about using your hip and use a chair so that you do not have to mind too much about your balance.
Execute the complete movement, but still use a chair or anything else for support to ease maintaining your balance.