It's always been my intention to do training upgrades throughout the game. Once you reach a certain point, Pichi will offer you the first of these (beginning with the next update).
You can choose what amount of effort you want to put towards a particular training activity. Single means you perform that action a single time (like normal), Half will use up around half of your current fatigue, while Full will perform the training until you're spent.
You can choose this option before each training attempt. While this doesn't give you ensured "great" results, you can save time by doing it this way. This allows you to spend more of your time with other activities.