The phrase "activity at a time" is correct and usable in written English.
It can be used to refer to the occurrence or engagement in a single activity during a specific period.
Example: "To improve productivity, it's essential to focus on one activity at a time rather than multitasking."
Alternatives: "task at a time" or "one thing at a time".
The goal is to encourage physical activity at a time when obesity among children is becoming an increasing problem.
A DECADE ago The Economist proposed the R-word index: an alternative indicator of economic activity at a time of widespread distrust of official British statistics.
But the evidence is ambiguous about whether tax cuts will really spur economic activity at a time when consumers and businesses alike are frozen in fear and reluctant to let go of their money.
"Berry Gordy's The Last Dragon" is a multimedia movie of sorts, designed for those who can't bear the monotony of only one thought or sound or activity at a time.
Although kidneys of the examined runners fully recovered within two days post-marathon, the study raises questions concerning potential long-term impacts of this strenuous activity at a time when marathons are increasing in popularity.
Private equity, when properly executed, is a proven asset class that can deliver superior returns to its investors and can provide capital, create jobs and drive positive economic activity at a time when our economy badly needs such support.
"Cycling and running are one-leg-at-a-time activities," he explained.
Most intriguing, however, were data suggestive of regenerative activity at a time-point in between - at 8 months of age, as rare dystrophic neurites became noticeable, a small increase in the number of spines and total dendritic area was observed in APP transgenic neurons in comparison to controls[29].
And Margot fills her days with endless societies and genteel activities at a time when many of her contemporaries would have been full-time mothers.
And Crosby is happy to increase the company's lending activities at a time when others are worrying about the prospect of a full-blown recession.
But polls indicate that he has been unable to convince a large percentage of the population that he was unaware of the activities at a time when he served as Mr. Chrétien's finance minister.
