Just wanted to share a drill that I had my students to do help them build conditioning and work on their positioning at the same time. The purpose of the drills is so they can practice the concept of movement while on top. It will also help them train their cardio specific to jiu jitsu.
In this video the partner on the bottom is doing a ton but there are variations you can do with it. The partner can do random thing such as lift arms, up turn into you, turn away from you, turn completely to their stomach, scoot their body, etc. You can also progress the resistance and move the drill up to a situational live drill.