The phrase "activities used" is correct and usable in written English.
It can be used when referring to specific actions or tasks that have been employed in a particular context or study.
Example: "The report outlines the various activities used to engage participants during the workshop."
Alternatives: "methods employed" or "tasks utilized".
The total percentage of active-learning activities used in this lecture course was greater than 65% of classroom time, including audience response device questions.
Activities used in the lesson varied from mind-mapping types of bullying to a discussion on the importance of standing up to bullies.
The US has long maintained that Carvajal, as well as his trafficking activities, used his position to help make Venezuela a haven for training Farc members.
Then there are the more serious activities used primarily when big-money commercial interests are threatened, such as the infiltration of opposition groups, otherwise known as spying.
Improved identification supports the additional assessment activities used by MNT-PC dietitians.
Latest improvements are presented with the comprehensive R&D activities used to validate the design.
The first section deals with activities used to acquaint the students with each other and the teacher with the students.
Sports, music, dance, and other recreational activities used to provide a welcome break, a time to relax and unwind.
The once-busy market has been closed and the income-generating activities used to occupy people's time have stopped.
Others, like my client, consider it to be customer marketing — that is, the communications and promotional activities used to attract and retain customers.
Throughout the mentees' reports and the mentors' reflections on their mentoring styles were descriptions of activities used by the mentors that contributed to their success.
