"usual activity" is correct and usable in written English.
You can use it when you are referring to an activity that someone or something typically engages in or participates in. For example: "Running is an usual activity for marathon runners."
On a stretch of Greenwich Street in TriBeCa, a construction site hummed with the usual activity.
Compared with the usual activity group, the yoga group had improvements in insomnia symptoms, a common complaint of menopause.
Here he is introducing himself: While there was plenty of the usual activity and speculation at the deadline, many of Europe's biggest clubs did their shopping early.
In February, call-outs to the AA rose 80 per cent on usual activity levels as ice and freezing fog brought chaos for many motorists.
Thus, a significant reduction in the administered activity (e.g. half of the usual activity) seems prudent [85].
However, LogDog is able to go a lot deeper because it can build a more thorough profile of your usual activity since it pulls data from multiple accounts.
We therefore postulate that the usual activity and toxicity tests would involve herbicide formulations used in contemporary agriculture and not to be limited to their active ingredients alone.
Moreover, authors considered lying on floor as a normal activity, but in fact lying on floor is not a usual activity.
"That's why there has been more than usual activity" against broadcast licensees.
Lots of the usual activity before and during, but it was after that things got really feral.
Also it is usual activity in a molecular phylogenetics project to re-design and optimize primers after an initial test run.
