For some players and teams, it's all work. A nice mixture of variety and stability helps. If I find something the players like to do, I will work that into several sessions during the season. We may stay with a game or exercise that the players are into for a long time or cut short a game or exercise and do something different. I make use restrictions to reinforce some technique, but also to have the players adapt and make decisions.
All players are active all the time or they are inactive for only very short times.
We divide the teams differently each session. Many exercises are built upon one another. The playing areas are marked initially to allow for the combination of players and quick movement into the next exercise. The rules may be changed with each exercise. One time, it is keepaway or dribble across the line to score, then it is on small goals.