: Use " There is no activity " when referring to a general state of stillness. Use " There are no activities " when referring to a specific list of events or tasks that are missing.

: To vary your writing, consider alternatives like "nothing is happening," "a lack of action," or "the situation was stagnant". 3. Digital and Social Activity Health Risks of an Inactive Lifestyle - MedlinePlus

: When describing a duration, use " no activity since [date] " or " no activity from [date] to [date] ".

The phrase "" can be understood in several ways depending on whether you are looking at it from a health, grammatical, or technical perspective. 1. Health: The Risks of an Inactive Lifestyle

If you are writing or speaking, it is important to use the phrase correctly to avoid grammatical errors.

: Watching TV, using a computer, playing video games, and long commutes.