See, that's a fallacy people believe which prevents them from acknowledging their laziness. The key is to work smarter, not harder.
Some things, such as getting fit or studying, are going to take effort. But the effort is an unintended side-effect of the work, not the goal. In my experience, if you work towards the solution and not think of it as "putting in X effort", the perceived effort is a lot less.
But to laziness, work is punishment.