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.
Divide a flip chart into boxes headed with 'Start', 'Continue' and 'Stop'. Ask your participants to write concrete proposals for each category - 1 idea per index card. Let them write in silence for a few minutes. Let everyone read out their notes and post them to the appropriate category. Lead a short discussion on what the top 20% beneficial ideas are. Vote on it by distributing dots or X's with a marker, e.g. 1, 2, and 3 dots for each person to distribute. The top 2 or 3 become your action items.
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.