Activity status depends on how often did you log into the game in recent days. To keep it as high as possible it's recommended to enter the game every day.
Each individual member activity status is then used to calculate the overall activity of the club. Depending on the club activity level, each member will be able to claim the rewards once per day. It's possible to do it in the Members tab in the Hunting club screen.
Activity rewards are available only if the club has at least 10 members.