There are several training presets. They are grouped (Mode) as Combo, Random, Defense. And divided into difficulty levels, Beginner, Advanced and Master. Selected a preset setting, you can fine tune it again in the training settings. Is random on, it will change the settings by interval. If you set something in the settings, random will go off.
If you have some good training, look in the settings and you can see what settings are set. As a member, you can save the current settings and load them another time.
There are also modes, these are explained below.