space out to ensure that someone is near the goal to allow easy access to the goal

communication: ensure our strategy like who to mark and our position: e. g. defender of the goalss to prevent people from scoring

To regain possession

Ensure that disc doesn't travel further into end-zone

Man-on-man marking to defend

Give pressure to opponent (e.g. running for the disc even though it's their turn)

Intercept disc, ensure that disc is not successfully passed

Spread out on the field, ensure that all space is covered

Use your body to block the offensive player, preventing them from getting into position to receive the frisbee

Focus on the position of the frisbee, finding good opportunities to intercept the passes