Draw a speedboat onto a flip chart paper. Give it a strong motor as well as a heavy anchor. Team members silently write on sticky notes what propelled the team forward and what kept it in place. One idea per note. Post the stickies motor and anchor respectively. Read out each one and discuss how you can increase 'motors' and cut 'anchors'.
Variation: Some people add an iceberg in the back of the image. The iceberg represents obstacles they already see coming.
Condense many possible actions down to just two the team will try Source:
Lydia Grawunder & Sebastian Nachtigall
Hand out index cards and markers. Tell everyone to write down the two actions they want to try next iteration - as concretely as possible (SMART). Then everyone pairs up with their neighbor and both together must merge their actions into a single list with two actions. The pairs form groups of 4. Then 8. Now collect every group's two action items and have a vote on the final two.
Let team members appreciate each other and end positively Source:
Agile Retrospectives who took it from 'The Satir Model: Family Therapy and Beyond'
Start by giving a sincere appreciation of one of the participants. It can be anything they contributed: help to the team or you, a solved problem, ...Then invite others and wait for someone to work up the nerve. Close, when no one has talked for a minute.