Once you're exercising (training) a lot then it starts to feel like you need to do it, and you need to do enough of it and do it in the right way. I'm a cyclist

Once you're exercising (training) a lot then it starts to feel like you need to do it, and you need to do enough of it and do it in the right way. I'm a cyclist, and I know that I'm grumpy/irritable/depressed if I haven't ridden. If I have a particularly tough session to do that day it can sometimes feel like a weight around my neck.