Body doubling is a technique used to improve focus and productivity, particularly for individuals with attention-deficit/hyperactivity disorder (ADHD). It involves having a partner or "body double" sit with you while you work on a specific task. 

The body double does not need to actively participate in the task, but their mere presence provides a sense of accountability and social support. This can help individuals stay focused, resist distractions, and complete tasks more efficiently. 

Parallel working creates the same results as the “body doubler” also takes on the task.

It is a simple strategy that can be beneficial for individuals who struggle with attention and focus.