What is the simplest way to stop procrastinating?

Shrink the task until starting feels ridiculous to refuse. Not 'write the report' but 'open the document and write one sentence.' Not 'go to the gym' but 'put on gym shoes.'

The brain evaluates the full cost of completion and resists. When you redefine a task by its start instead of its finish, resistance collapses. Once you start, the Zeigarnik Effect drives you to continue.