The phrase "a fruitful activity" is correct and usable in written English.
You can use it to describe an activity that yields positive results or benefits, often in a productive or rewarding context.
Example: "After several brainstorming sessions, we finally engaged in a fruitful activity that led to innovative solutions for our project."
Alternatives: "a productive endeavor" or "a rewarding task".
All this seems highly becoming to a poet of fruitful activity, not barren speculation.
Leisure is not about lying around doing nothing but eating and drinking: a distinction between fruitful activity and work or labour undertaken to earn enough to live on is fundamental to this debate.
"His holiness is grateful for the thoughtful gesture and for the feelings which it evoked, hoping for an always more fruitful activity in the service of young generations and the spread of genuine human and Christian values," wrote Peter B Wells, a senior official at the Vatican secretariat of state.
I retreat into Twitter to procrastinate when I'm at work and when I'm off the clock, my social media addiction steals away my time from doing more fruitful activities, like reading a book or writing in my journal.
These findings are consistent with the predictions of Action Regulation Theory [Hacker, W. (1985). Activity: A fruitful concept in industrial psychology. In M. Frese, J. Sabini (Eds)., Goal directed behaviour: The concept of action in psychology.
This paper reviews some of the activities conducted in a fruitful interdisciplinary collaboration between physicists, engineers, biologists and physicians.
To begin with, television, video games and the Internet have created a "culture of distraction" that has shortened attention spans and left people with "less time and desire" for "two human activities critical to a fruitful and demanding intellectual life: reading and conversation".
Exploring the association between (extreme high and low) anxiety and physical activity behavior in pregnancy may be a fruitful area for future research.
The fundamentals of d-serine function, in the retina and elsewhere, remain a fruitful topic of study, both as a part of normal physiological activity and as a mechanistic contributor to various disease pathologies.
The lesson plan includes three activity sheets to prompt close questioning and to facilitate a fruitful debate.
