Y is for Yoga.
Yoga means activities.
As per Jainism, we do yoga in three different ways. We perform yoga, by physical, verbal or mental means. That means that we're doing yoga all the time. All of our activities good or bad brings karma* to our soul. Therefore, we should control our activities. We can do this by paying attention to what we do. It is easy to control physical yoga, but it is harder to control verbal yoga and mental yoga is the most difficult to control. Therefore, be careful when you want to do something, and be sure that you are not doing, saying or thinking anything bad.
In Jainism, yoga and meditation are two different things.
*look under K