"form of activity" is a correct and usable phrase in written English.
You can use it when you want to refer to any kind of physical or mental action that someone does for a purpose, such as work, sport, entertainment, or study. For example: "Singing is an important form of activity in my life; it helps me to relax and express my emotions."
"This form of activity, this behavior, cannot be tolerated.
To work for the UN is to engage in a high form of activity since it involves laboring for a good principle with bad equipment.
Literature, as a form of activity with no guaranteed results, suits this generation, even though, in Russia, as elsewhere, people are reading fewer and fewer books.
The chemicals that show some form of activity when they come in contact with the protein are then culled.
The pleasures of walking are greater than in any other form of activity – whether brisk walking to get to a specific destination quickly, long-distance walking for exercise, or a saunter to the local park (or just to the local).
The researchers found that 54percentt of the time, onlookers stood by passively as the bully picked on the victim, an inactive form of activity that the researchers said ended up reinforcing the bully's behavior.
In 2010, British Columbia (BC) introduced a controversial, but limited, form of activity-based funding (ABF) for hospitals.
We have proposed that episodes of activity are regulated by a slow form of activity-dependent network depression that operates over several minutes [8].
The mossy fiber synapse in adult mice is characterized by remarkable synaptic facilitation [2], [5], [26], a form of activity-dependent short-term synaptic plasticity.
Experience constructs the neural network in the form of activity-dependent spine morphogenesis, which is central to memory formation and other adaptive changes of the brain.
Market changes, labor shortages, and the introduction of a form of activity-based costing (diagnosis treatment combination (DTC) financing policy) in the Netherlands have provided an impetus for hospitals to reorganize care processes to improve efficiency.
