Let’s face it, if we all just exercised when we wanted to then we’d sweat maybe once or twice each week, which is fine if you’re not working towards anything but if you have goals (whether physical, mental, challenge-based etc.) then chances are you’re going to need to be training more than this.
It’s not just the volume of training that’s important (or not, depending on what you’re working towards) but it’s the quality and diversity. Some of it is going to hurt, some of it is going to be within your comfort zones and other bits are going to be plain boring.